Audiobus: Use your music apps together.
Audiobus is the app that makes the rest of your setup better.
Essential trick with iMS20/Memphis
If you own Moog's Model D app you'll know that the feedback circuit is essential for many of the timbres it's most famous for.
The iMS20/Memphis has a similar trick up it's sleeve but it's not quite so obvious. Having said that, it's capable of so much more.
As you can see, you can feed the virtual headphone jack to the external signal processor before feeding it back into VCO mixer pre the filter. This is actually a lot more powerful than Moogs feedback circuit as you can process the signal before feeding it back into the VCO mixer. For bass sounds I like to filter the bottom end out first so all the saturation goodness is occurring on the higher harmonics one it its the main filters (keeping out of the way of the lower fundamental frequencies).
One word of warning, the signal level on the External Signal Processor starts clipping at a value of 1.00 (out of 10.00), as the headphone output is far hotter than general audio rate signals in the modular section of iMS20, so less is more unless you want a gnarly clipping mess (all good if that was your goal). This feedback trick completely changes the character of the iMS20 in a very good way.
This how I've used it in a typical bass patch.
You'll find that everything responds differently once you feed the headphone socket signal into the filter inclusive of the envelopes so you'll often want to exaggerate settings from their previous state. You can get some really lovely timbres by exaggerating the high-pass filter (especially the resonance/peak) before hitting the low-pass.
Apologies for not sharing an instant gratification patch. It's intentional, as you only get a feel for iMS20 when you start tweaking away. Much like Odyssei it can go through massive timbral shifts with what seems to be minor tweaks, but you get a feel for it pretty quickly.