It’s nothing new as I hear the effect in chip tunes sometimes (I think Vortex Tracker supports it too), however here’s a little test program to let the PSG make some sound other than the normal square wave; a nice (logarithmic) sawtooth wave:
10 SOUND 0,1 20 SOUND 1,0 30 SOUND 13,8 50 FOR N = -33 TO 15 60 F=440*2^(N/12) 70 I=3579545#/F/256-1+.5 80 SOUND 11,I AND 255 90 SOUND 12,I \ 256 100 SOUND 8,16 110 FOR J=0 TO 2000:NEXT 120 NEXT 130 SOUND 8,0
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