Eduardo Robsy Petrus wrote:
I suscribed today to this mailing-list.
Welcome!
First of all, please forgive my awful english, 'cause I am spanish (and of course, my dutch is even worse).
It seems fine to me, don't worry :)
My initial question is the following: how can I produce a "vibratto" using only the PSG? I was amazed when I heard MATRA's productions music and sound featuring only PSG support. I guess that I have to combine envelopes and change simultaneously the frequency. Am I right?A vibrato is just a modulation of the frequency. You get this effect if you adapt the frequency every interrupt (1/50th (PAL) or 1/60th (NTSC) of a second) like this: +0, -1, -2, -2 ,-1, +0, +1, +2, +2, +1
This gives you a mild vibrato. You could also take into account the PSG works in periods not frequencies, so for higher notes there is more dramatic effect. You can compensate for this ofcourse, but it's easier to just have it in mind when composing the song.
A tremolo works the same way, but then for the volume. You cannot use tremolo on the envelopes, because they are fixed volume. Maybe you can create some effects by switching envelopes, but it is often more versatile to disregard the envelopes and program them yourself using the volume register.
I hope this was clear enough ^^;
If you have any other questions, feel free to ask!
Greetz,
Patriek
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