If you want a bunch of other stuff in there and are considering a 321, you might also look at a small dual LPG like the Takaab or Meng Qi ones. I have both. I particularly recommend the Takaab one for the mode switches and how ungodly cheap it is, but the Meng Qi one is popular and sounds great. I use them with a 321 for some control and it's a great dual LPG setup for cheap that can open up some new signal paths for your modules with a specific character you can't get from the 130-8.
Also, instead of an oscillator (or alongside it), I might recommend a humble noise source. In combination with the LPG/VCA and the Wogglebug audio sources you could get some great percussion going in a small space with stuff you already have. The Verbos Noise & Filter is a unique device for this purpose - you could use the filter bank with the noise or any other sound source.