<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div><font size="2">Surely it’s all about minimizing parts count. If your microprocessor can just as easily generate an inverted pulse as a non inverted pulse, it can save a few pieces of silicon.</font></div><div><span style="font-size: 13px;"><br></span></div><span style="font-size: 13px;">This seems consistent with the old lines of drum machines. </span><div><span style="font-size: 13px;">Example, my TR-66 uses </span><font size="2">low-going pulses.</font></div><div><font size="2">Example, my Korg Mini Pops machines have their decay capacitor tied to +V and decay is the charging of the cap, not the discharge.</font></div><div><font size="2"><br></font><div style="font-size: 13px;">The simple “swing-vca” envelope circuits often needed to be pulled to ground or -V. </div><div style="font-size: 13px;"><br></div><div style="font-size: 13px;">The ringing filter circuits (twin-t or coil) normally use a positive-going pulse, and the DR-110 does for the kick drum too.</div><div style="font-size: 13px;">(But noting the snare oscillator triggers with a negative pulse here.)</div><div style="font-size: 13px;">And as you might expect, a ringing circuit does not care so much what phase the trigger pulse is in, as long as it sounds nice with the other drums.</div><div style="font-size: 13px;"><br></div><div style="font-size: 13px;"><br></div><div style="font-size: 13px;">I just stuffed a DR-110 analog board into my Drumbrute. After trying some logic chips, I settled on some cheap transistors to invert the logic for the snare, clap, and cymbal sounds. </div><div style="font-size: 13px;"><br></div><div style="font-size: 13px;">A Modwiggler schematic shows a diode added to the bass drum trigger path. I did not see any benefit to this with a drum machine that guarantees a well-formed pulse signal.</div><div style="font-size: 13px;"><br></div><div>Benjamin</div></div></body></html>