enhancement: Turn on/off metronome while playing

[takagiy]

This is a feature request.
I think editing would be easy if i can use a virtual metronome that counts the beats in accordance with the project's tempo value. Although UTAU doesn't have it, the feature is popular among many audio editing software (e.g. Piapro Studio the vocal synth editor).

[atoko]

Hey,

I can take a look at this -- are there any concerns WRT running a second Media object to the same Media Player, or is it an exclusive channel? (In which case I'd have to instantiate a second MediaPlayer)

[atoko]

MediaPlayer is monophonic, so as the issue mentioned, there needs to be a separate thread that synchronizes with the MediaPlayer object -- I have no knowledge of the internals, but a metronome could be implemented via the onMarker event, if processing event markers isn't too resource intensive on the CPU

[titinko]

When making the debug instrumental feature, I just used two media players. To my knowledge there aren't any consequences to doing so. They run on separate threads by default as you can see in the playback method: https://github.com/titinko/utsu/blob/master/src/main/java/com/utsusynth/utsu/engine/Engine.java#L114

[atoko]

@takagiy This has been implemented in #94, and is available as a branch. It would be useful to have this beta tested. One facet I'm not sure about is the metronome sound itself.

The current implementation uses a pitched, slightly distorted square wave as the sound, but I'm aware most metronomes use noise pulses. Is this something that should be configurable?

[takagiy]

@atoko Lovely! Thanks so much for a lot of your works!
I think that the metronome sound can vary depending on software and has not to be realistic metronome sound.
In most cases, only one type of metronome sound is provided (not configurable).
Could you give me some days to try the latest implementation?