It's interesting to experiment with all sorts of pedals in the context of synth sound, especially if you have a semi-modular synth and can change the sound path within the instrument. I didn't use a PWM Malevolent, but I had an MS-20 mini, with which you can, for example, create a feedback loop with an ext. signal processor and add several external pedals to this loop. If the last of them has a stereo output (delay, for example), you can additionally route the free channel to the envelope\filter control module and get something interesting, especially if there are modulation effects in the chain. Perhaps you can do something like that in your case.
As for overdrive/distortion, I like to use them with minimal gain on a synthesizer, but in other cases maximum overdrive can be very useful if you are experimenting with initially "quiet" sounds. For example, the Boss Metalzone, which I don't really like to use with guitar, is great for noise - it sounds sharp and is quite flexible to configure, which is very useful.
