There’s this feature I developed yesterday for the Shruthi-1 (and unfortunately relying on one bit of code reorganization I did that makes it hard to port to the Shruti-1): the transient generator.
How it works is that you have new entries in the sub-oscillator waveforms list. When you select those, instead of getting the suboscillator, you get a palette of clicky/impulsive sounds played at the beginning of each note and adjustable in amplitude by the sub osc rate.
I implemented this because I wanted an extra something for synthetic drum tones, but it’s quite useful too for organs. I haven’t seen this concept in much places, except the Roland D- series of course. If you have ideas of sounds I could put in this slot, or know a library of sampled attacks, I’d love to have a look at it!