Yeah I try to do similar tricks on SN76489, although slightly more limited than YM2149 (no built-in eg) we can do similar tricks with software volume modulation...that is the main reason for my Master System experiment and then SMS PSG vst by the way 
Here >> Only 1 Tone channel of PSG + faster and faster arpeggio...listen what happens at 17sec...:)
http://www.alyjameslab.com/tutorials/SN … ONECH1.wav
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Solar System
Wow sounds good. Beautiful triangle shaped bass!!!