you could definitely make a case for too many sound sources atm, I’m still experimenting with which I like best, regardless i will NEVER sell the Black DPO but it may occasionally leave the system. Been thinking about going this direction with the system and swapping in the DPO if I ever want to use its timbres (which I love).
with regards to sisters v twinpeak- VERY different beasts that I think are completely incomparable to each other. As a filter twinpeak is more gentle, useful at low resonance settings for carving out high end without imposing too much character on the sound, though you can definitely crank the resonance and make things pretty gnarly. Sisters definitely leaves its mark on sounds more, especially given how it almost always drives the input sound to subtle distortion and it’s seemingly impossible to have a setting with truly no resonance. Both ping beautifully but Twinpeak’s pings are one-of-a-kind other-worldly good. If you played for someone a sequence of the twinpeak as a sound source without telling them what made the sound, they would probably guess some kind of xylophone or thumb piano, it is truly an amazingly natural sounding thing, just gorgeous. The timbre of the ping is also super flexible and adjustable when you use the filter in bandpass mode and play with the peak locations. It does not fully self-oscillate though, so you have to ping it with triggers and the ping length is determined by the resonance with a really nice range. The double inputs with a crossfader are super fun with this use, as you can flip between/combine different trigger sequences. I will also say that the Twinpeak’s bandpass abilities are deeper than sisters that you can adjust the bandwidth very precisely.
but sisters’ design in general as a filter is perhaps more fun especially when you think outside the box and get creative with it. and it can do so many great things as a sound source as well, just in a different way than twinpeak.