diff --git a/miv/visualization/activity.py b/miv/visualization/activity.py
index 620c3629..e223fb27 100644
--- a/miv/visualization/activity.py
+++ b/miv/visualization/activity.py
@@ -132,770 +132,3 @@ def __call__(self, spikestamps: Spikestamps, mea: MEAGeometryProtocol):
         plt.close(plt.gcf())
 
         return
-
-
-# DEBUG: Temporary activity visualization for 512 electrode debugging
-@dataclass
-class NeuralActivity512(OperatorMixin):  # pragma: no cover
-    bin_size: float = 0.001  # sec
-    firing_rate_interval: float = 1.0  # sec
-    skip_interval: int = 50  # frames to skip. TODO: refactor
-
-    tag: str = "neural activity render"
-
-    progress_bar: bool = False
-
-    fps: int = 25
-    minimum_split_size: int = 60  # sec. Each video is at least 1 min
-
-    def __post_init__(self):  # pragma: no cover
-        super().__init__()
-        self.runner = StrictMPIRunner()
-
-    def __call__(
-        self, spikestamps: Spikestamps, mea: MEAGeometryProtocol
-    ):  # pragma: no cover
-        comm = self.runner.comm
-        rank = self.runner.get_rank()
-        size = self.runner.get_size()
-
-        # Binning in first rank
-        if self.runner.is_root():
-            binned = spikestamps.binning(self.bin_size, return_count=True)
-            probe_times = binned.timestamps[:: self.skip_interval]
-        else:
-            probe_times = None
-        probe_times = comm.bcast(probe_times, root=self.runner.get_root())
-
-        # Split Tasks
-        num_frames = probe_times.shape[0]
-        if size * self.fps * self.minimum_split_size > num_frames:
-            size = np.ceil(num_frames / (self.fps * self.minimum_split_size)).astype(
-                np.int_
-            )
-            if rank == self.runner.get_root():
-                logging.warning(
-                    f"Too many ranks. Splitting into {size} tasks for total {num_frames} frames."
-                )
-            if rank >= size:
-                return
-
-        # Get spikestamps view
-        probe_times = np.array_split(probe_times, size)[rank]
-        start_time = probe_times[0]
-        end_time = probe_times[-1]
-        spiketrains_bins = spikestamps.get_view(start_time, end_time).binning(
-            self.bin_size, return_count=True
-        )
-        logging.info(
-            f"{rank=} | rendering from {start_time=:.03f} to {end_time=:.03f}: {probe_times.shape[0]} frames."
-        )
-
-        # Find firing rate
-        xs = []
-        for i in range(spiketrains_bins.number_of_channels):
-            x = spike_counts_with_kernel(
-                spikestamps[i],
-                probe_times,
-                lambda x: np.logical_and(x > 0, x < self.firing_rate_interval).astype(
-                    np.float_
-                ),
-            )
-            xs.append(x)
-        xs = np.asarray(xs)
-
-        xmax = np.max(xs)
-        xmin = np.min(xs)
-
-        # DEBUG
-        electrode_map_512 = (
-            np.array(
-                [
-                    [
-                        48,
-                        211,
-                        214,
-                        217,
-                        220,
-                        223,
-                        226,
-                        229,
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-                        16,
-                        245,
-                        248,
-                        251,
-                        254,
-                        193,
-                        196,
-                        197,
-                        200,
-                        203,
-                        206,
-                        113,
-                        179,
-                        182,
-                        185,
-                        188,
-                        191,
-                        130,
-                        133,
-                        136,
-                        139,
-                        142,
-                        81,
-                        147,
-                        150,
-                        153,
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-                        159,
-                        162,
-                        165,
-                        168,
-                        171,
-                        174,
-                        467,
-                        470,
-                        473,
-                        476,
-                        479,
-                        482,
-                        485,
-                        488,
-                        491,
-                        494,
-                        304,
-                        499,
-                        502,
-                        505,
-                        508,
-                        511,
-                        450,
-                        453,
-                        456,
-                        459,
-                        462,
-                        272,
-                        435,
-                        438,
-                        441,
-                        444,
-                        445,
-                        448,
-                        387,
-                        390,
-                        393,
-                        396,
-                        369,
-                        403,
-                        406,
-                        409,
-                        412,
-                        415,
-                        418,
-                        421,
-                        424,
-                        427,
-                        430,
-                        337,
-                    ],
-                    [
-                        209,
-                        45,
-                        42,
-                        39,
-                        36,
-                        33,
-                        30,
-                        27,
-                        24,
-                        21,
-                        18,
-                        241,
-                        13,
-                        10,
-                        7,
-                        4,
-                        1,
-                        62,
-                        59,
-                        56,
-                        53,
-                        50,
-                        177,
-                        116,
-                        119,
-                        122,
-                        125,
-                        128,
-                        67,
-                        70,
-                        73,
-                        76,
-                        79,
-                        145,
-                        84,
-                        87,
-                        90,
-                        93,
-                        96,
-                        99,
-                        102,
-                        105,
-                        108,
-                        111,
-                        274,
-                        277,
-                        280,
-                        283,
-                        286,
-                        289,
-                        292,
-                        295,
-                        298,
-                        301,
-                        496,
-                        306,
-                        309,
-                        312,
-                        315,
-                        318,
-                        257,
-                        260,
-                        263,
-                        266,
-                        269,
-                        464,
-                        335,
-                        332,
-                        329,
-                        326,
-                        323,
-                        384,
-                        381,
-                        378,
-                        375,
-                        372,
-                        400,
-                        367,
-                        364,
-                        361,
-                        358,
-                        355,
-                        352,
-                        349,
-                        346,
-                        343,
-                        340,
-                        432,
-                    ],
-                    [
-                        47,
-                        212,
-                        215,
-                        218,
-                        221,
-                        224,
-                        227,
-                        230,
-                        233,
-                        236,
-                        239,
-                        15,
-                        244,
-                        247,
-                        250,
-                        253,
-                        256,
-                        195,
-                        198,
-                        201,
-                        204,
-                        207,
-                        114,
-                        180,
-                        183,
-                        186,
-                        189,
-                        192,
-                        131,
-                        134,
-                        137,
-                        140,
-                        143,
-                        82,
-                        148,
-                        151,
-                        154,
-                        157,
-                        160,
-                        163,
-                        166,
-                        169,
-                        172,
-                        175,
-                        466,
-                        469,
-                        472,
-                        475,
-                        478,
-                        481,
-                        484,
-                        487,
-                        490,
-                        493,
-                        303,
-                        498,
-                        501,
-                        504,
-                        507,
-                        510,
-                        449,
-                        452,
-                        455,
-                        458,
-                        461,
-                        271,
-                        434,
-                        437,
-                        440,
-                        443,
-                        446,
-                        385,
-                        388,
-                        391,
-                        394,
-                        397,
-                        370,
-                        402,
-                        405,
-                        408,
-                        411,
-                        414,
-                        417,
-                        420,
-                        423,
-                        426,
-                        429,
-                        338,
-                    ],
-                    [
-                        210,
-                        44,
-                        41,
-                        38,
-                        35,
-                        32,
-                        29,
-                        26,
-                        23,
-                        20,
-                        17,
-                        242,
-                        12,
-                        9,
-                        6,
-                        3,
-                        64,
-                        61,
-                        58,
-                        55,
-                        52,
-                        49,
-                        178,
-                        117,
-                        120,
-                        123,
-                        126,
-                        65,
-                        68,
-                        71,
-                        74,
-                        77,
-                        80,
-                        146,
-                        85,
-                        88,
-                        91,
-                        94,
-                        97,
-                        100,
-                        103,
-                        106,
-                        109,
-                        112,
-                        273,
-                        276,
-                        279,
-                        282,
-                        285,
-                        288,
-                        291,
-                        294,
-                        297,
-                        300,
-                        495,
-                        305,
-                        308,
-                        311,
-                        314,
-                        317,
-                        320,
-                        259,
-                        262,
-                        265,
-                        268,
-                        463,
-                        336,
-                        333,
-                        330,
-                        327,
-                        324,
-                        321,
-                        382,
-                        379,
-                        376,
-                        373,
-                        399,
-                        368,
-                        365,
-                        362,
-                        359,
-                        356,
-                        353,
-                        350,
-                        347,
-                        344,
-                        341,
-                        431,
-                    ],
-                    [
-                        46,
-                        213,
-                        216,
-                        219,
-                        222,
-                        225,
-                        228,
-                        231,
-                        234,
-                        237,
-                        240,
-                        14,
-                        243,
-                        246,
-                        249,
-                        252,
-                        255,
-                        194,
-                        199,
-                        202,
-                        205,
-                        208,
-                        115,
-                        181,
-                        184,
-                        187,
-                        190,
-                        129,
-                        132,
-                        135,
-                        138,
-                        141,
-                        144,
-                        83,
-                        149,
-                        152,
-                        155,
-                        158,
-                        161,
-                        164,
-                        167,
-                        170,
-                        173,
-                        176,
-                        465,
-                        468,
-                        471,
-                        474,
-                        477,
-                        480,
-                        483,
-                        486,
-                        489,
-                        492,
-                        302,
-                        497,
-                        500,
-                        503,
-                        506,
-                        509,
-                        512,
-                        451,
-                        454,
-                        457,
-                        460,
-                        270,
-                        433,
-                        436,
-                        439,
-                        442,
-                        447,
-                        386,
-                        389,
-                        392,
-                        395,
-                        398,
-                        371,
-                        401,
-                        404,
-                        407,
-                        410,
-                        413,
-                        416,
-                        419,
-                        422,
-                        425,
-                        428,
-                        339,
-                    ],
-                    [
-                        0,
-                        43,
-                        40,
-                        37,
-                        34,
-                        31,
-                        28,
-                        25,
-                        22,
-                        19,
-                        0,
-                        0,
-                        11,
-                        8,
-                        5,
-                        2,
-                        63,
-                        60,
-                        57,
-                        54,
-                        51,
-                        0,
-                        0,
-                        118,
-                        121,
-                        124,
-                        127,
-                        66,
-                        69,
-                        72,
-                        75,
-                        78,
-                        0,
-                        0,
-                        86,
-                        89,
-                        92,
-                        95,
-                        98,
-                        101,
-                        104,
-                        107,
-                        110,
-                        0,
-                        0,
-                        275,
-                        278,
-                        281,
-                        284,
-                        287,
-                        290,
-                        293,
-                        296,
-                        299,
-                        0,
-                        0,
-                        307,
-                        310,
-                        313,
-                        316,
-                        319,
-                        258,
-                        261,
-                        264,
-                        267,
-                        0,
-                        0,
-                        334,
-                        331,
-                        328,
-                        325,
-                        322,
-                        383,
-                        380,
-                        377,
-                        374,
-                        0,
-                        0,
-                        366,
-                        363,
-                        360,
-                        357,
-                        354,
-                        351,
-                        348,
-                        345,
-                        342,
-                        0,
-                    ],
-                ],
-                dtype=np.int_,
-            )
-            - 1
-        )
-        for a, b in zip(range(288, 319 + 1), range(287, 256 + 1)):
-            ma = electrode_map_512 == a
-            mb = electrode_map_512 == b
-            electrode_map_512[ma] = b
-            electrode_map_512[mb] = a
-        for a, b in zip(range(96, 127 + 1), range(95, 64 + 1)):
-            ma = electrode_map_512 == a
-            mb = electrode_map_512 == b
-            electrode_map_512[ma] = b
-            electrode_map_512[mb] = a
-        nr, nt = electrode_map_512.shape
-        it = np.linspace(np.pi / 2, np.pi / 2 - 2 * np.pi, nt + 1)[::-1]  # pcb flipped
-        it = (it[1:] + it[:-1]) / 2.0
-        ir = np.linspace(4950, 3300, nr)
-        tv, rv = np.meshgrid(it, ir)
-        xv = rv * np.cos(tv) + 1650
-        yv = rv * np.sin(tv) - 1650
-
-        def map_electrode_data(vector, missing_value=0.0):
-            grid = electrode_map_512
-            value_grid = np.full_like(grid, missing_value, dtype=np.float_)
-            for idx, value in enumerate(vector):
-                if idx not in grid:
-                    continue
-                value_grid[grid == idx] = value
-            return xv, yv, value_grid
-
-        # DEBUG
-        if self.runner.is_root():
-            plt.figure()
-            plt.plot(xv.ravel(), yv.ravel(), "k.", ms=1)
-            plt.axvline(0, color="red", linestyle=":")
-            plt.axhline(0, color="red", linestyle=":")
-            plt.savefig(os.path.join(self.analysis_path, "grid_electrodes.png"))
-            plt.close("all")
-
-            # Test
-            index = np.arange(xs.shape[0])
-
-            X, Y, Z = mea.map_data(index)
-            fig, ax = plt.subplots(1, 1, figsize=(16, 16))
-            ax.scatter(X.ravel(), Y.ravel())
-            for i, txt in enumerate(Z.ravel()):
-                ax.annotate(str(int(txt)), (X.ravel()[i], Y.ravel()[i]))
-            X, Y, Z = map_electrode_data(index)
-            ax.scatter(X.ravel(), Y.ravel())
-            for i, txt in enumerate(Z.ravel()):
-                ax.annotate(str(int(txt)), (X.ravel()[i], Y.ravel()[i]))
-            plt.axvline(0, color="red", linestyle=":")
-            plt.axhline(0, color="red", linestyle=":")
-            ax.set_aspect("equal")
-            plt.savefig(os.path.join(self.analysis_path, "grid.png"))
-            plt.close("all")
-
-            X, Y, Z = mea.map_data(index)
-            eX, eY, eZ = map_electrode_data(index)
-            fig = plt.figure(figsize=(8, 6))
-            ax = fig.add_subplot(111)
-            ax.plot(mea.coordinates[:, 0], mea.coordinates[:, 1], "k.", ms=1)
-            pcm = ax.pcolormesh(
-                X,
-                Y,
-                Z,
-                cmap="twilight",
-                vmin=index.min(),
-                vmax=index.max(),
-                shading="gouraud",
-            )
-            ax.scatter(
-                eX.ravel(),
-                eY.ravel(),
-                c=eZ.ravel(),
-                cmap="twilight",
-                vmin=index.min(),
-                vmax=index.max(),
-            )
-            cbar = fig.colorbar(pcm, ax=ax)
-            cbar.ax.set_ylabel(
-                f"activity per {self.firing_rate_interval:.03f} sec", rotation=270
-            )
-
-            ax.set_aspect("equal")
-            ax.set_xlabel("channels x-axis")
-            ax.set_ylabel("channels y-axis")
-            ax.set_title("Spatial Neural Activity (--)")
-            plt.savefig(os.path.join(self.analysis_path, "grid_test.png"))
-            plt.close("all")
-        # DEBUG
-
-        # Output Images
-        FFMpegWriter = manimation.writers["ffmpeg"]
-        metadata = dict(
-            title="Movie Test", artist="Matplotlib", comment="Movie support!"
-        )
-        writer = FFMpegWriter(fps=self.fps, metadata=metadata)
-
-        os.makedirs(self.analysis_path, exist_ok=True)
-        video_name = os.path.join(
-            self.analysis_path, f"output_from_{start_time:.03f}_to_{end_time:.03f}.mp4"
-        )
-
-        fig = plt.figure(figsize=(8, 6))
-        with writer.saving(fig, video_name, dpi=200):
-            for timestep, time in tqdm(
-                enumerate(probe_times),
-                desc=f"Rendering {rank}/{size}",
-                position=rank,
-                total=probe_times.shape[0],
-                disable=not self.progress_bar,
-            ):
-                data = xs[:, timestep]
-                X, Y, Z = mea.map_data(data)
-                eX, eY, eZ = map_electrode_data(data)
-
-                fig.clf()
-                ax = fig.add_subplot(111)
-                # X, Y, Z = interp_2d(Z)
-                ax.plot(mea.coordinates[:, 0], mea.coordinates[:, 1], "k.", ms=1)
-                pcm = ax.pcolormesh(
-                    X, Y, Z, cmap="Oranges", vmin=xmin, vmax=xmax, shading="gouraud"
-                )
-                ax.scatter(
-                    eX.ravel(),
-                    eY.ravel(),
-                    c=eZ.ravel(),
-                    cmap="Oranges",
-                    vmin=xmin,
-                    vmax=xmax,
-                )
-                cbar = fig.colorbar(pcm, ax=ax)
-                cbar.ax.set_ylabel(
-                    f"activity per {self.firing_rate_interval:.03f} sec", rotation=270
-                )
-
-                ax.set_aspect("equal")
-                ax.set_xlabel("channels x-axis")
-                ax.set_ylabel("channels y-axis")
-                ax.set_title(f"Spatial Neural Activity ({time:.03f} sec)")
-
-                writer.grab_frame()
-        plt.close(plt.gcf())
-
-        return
diff --git a/miv/visualization/event.py b/miv/visualization/event.py
index ea351e62..e40595a8 100644
--- a/miv/visualization/event.py
+++ b/miv/visualization/event.py
@@ -25,6 +25,9 @@ def plot_spiketrain_raster(
     """
     fig, ax = plt.subplots(figsize=(16, 6))
     spikes = spikestamps.get_view(t_start, t_stop)
+    print(
+        f"Plotting raster plot from {t_start} to {t_stop}: {sum(spikes.get_count())} spikes"
+    )
     ax.eventplot(spikes)
     ax.set_xlabel("Time (s)")
     ax.set_ylabel("Channel")
diff --git a/pyproject.toml b/pyproject.toml
index 5a0955fa..69006383 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "MiV-OS"
-version = "0.3.1.pre1"
+version = "0.3.1.pre2"
 description = "Python software for analysis and computing framework used in MiV project."
 readme = "README.md"
 authors = ["GazzolaLab <skim449@illinois.edu>"]
@@ -246,4 +246,5 @@ omit = [
     "miv/io/intan/rhs.py",# not part of the dev target
     "miv/io/asdf/asdf.py",# not part of the dev target
     "miv/visualization/colors.py",# not part of the dev target
+    "miv/visualization/format.py",
 ]