Some tips for using the feedback option of the Korg Arp Odyssey to get a nice lead sound:
sufficient output level: volume wide open, drive on
adjust headphone output level to find sweetspot
best results with filter I and II
when using filter I, put resonance to the max
use the frequency of the High Pass Filter to create Wah type of effect.
Except for the final sound, where some delay was added, no effects were applied.