diff --git a/src/AudioGeneratorRTTTL.cpp b/src/AudioGeneratorRTTTL.cpp
index 1845949b..b45254b8 100644
--- a/src/AudioGeneratorRTTTL.cpp
+++ b/src/AudioGeneratorRTTTL.cpp
@@ -51,16 +51,6 @@ bool AudioGeneratorRTTTL::isRunning()
   return running;
 }
 
-// Can't do pure square wave, the I2S DACs don't like being fed them
-static int16_t period[64] PROGMEM = {
-  250, 500, 1000, 2000, 4000, 8000, 16000, 32000, 32000, 31000, 32000, 31000,
-  32000, 31000, 32000, 31000, 32000, 31000, 32000, 32100, 32000, 31000, 32000,
-   31000, 32000, 32000, 16000, 8000, 4000, 2000, 1000, 500,
-  -250, -500, -1000, -2000, -4000, -8000, -16000, -32000, -32000, -31000,
-  -32000, -31000, -32000, -31000, -32000, -31000, -32000, -31000, -32000,
-  -32100, -32000, -31000, -32000, -31000, -32000, -32000, -16000, -8000,
-  -4000, -2000, -1000, -500 };
-
 bool AudioGeneratorRTTTL::loop()
 {
   if (!running) goto done; // Nothing to do here!
@@ -84,8 +74,7 @@ bool AudioGeneratorRTTTL::loop()
     while (samplesSent < ttlSamples) {
       int samplesSentFP10 = samplesSent << 10;
       int rem = samplesSentFP10 % ttlSamplesPerWaveFP10;
-      rem = (64 * rem) / ttlSamplesPerWaveFP10;
-      int16_t val = pgm_read_word(&period[rem]);
+      int16_t val = (rem > ttlSamplesPerWaveFP10/2) ? 8192:-8192;
       int16_t s[2] = { val, val };
       if (!output->ConsumeSample(s)) goto done;
       samplesSent++;