This Octatrack sidechain pumping tutorial can also be applied to the Digitone.
I used a Digitakt to send the Digitone cc’s. I think you can use a midi loop-back trick too. The Digitakt is set to send midi out to channel 10. Val 1 is set to 127. CC select 1 is set to 27 (filter base). The LFO is set to sent to cc val 1. Speed=2, BPM=16, 0 fade, Wave=exp, Start phase=0, mode=oneshot, depth is -64.
The digitakt is set to send trigger-less trigs on 1,5,9, and 13. (Make sure LFO trigger is on.) I put a kick drum on those steps too.
The digitone triggers a 1/32nd bass note on every sequencer step; 1, 2,3,… You might need to adjust the filter base.
Sounds like this… First the bass alone, and then with the sidechain pumping.