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kliepatsch

PSG voice phase reset?

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Hi all,

suppose I start playing a tone with the programmable sound generator (PSG), the phase of the tone seems to be reset upon start of the emulator, but once a tone has been played with that voice, its phase seems to be scrambled.

My question is, if there is a way or some trick to reset / control the phase of the PSG oscillators before starting to play a tone?

This could be useful for a range of scenarios:

  • When playing a triangle wave, there will be a click at the start of the tone. Its loudness and tone colour depend upon the phase of the oscillator when it's turned on. A way to control this would be nice.
  • Playing two oscillators of similar pitch at once (e.g. two triangles for increased volume, or a triangle and a sawtooth to combine their colours). The interference between the two depends upon the relative phase of the oscillators and it would also be nice to be able to control it somehow.

I suspect that the phase information is stored in an internal variable inside the VERA and there's no way to control it directly. But I am hoping, maybe there could be a way to do some acrobatics with the PSG registers to influence the phase?

Edited by kliepatsch

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