I also thought that sensitivity might be the issue, it’s weird because the h9 Ultraswell works just fine as well as all the other Algos
fwiw – my guitar is going into a SynergyAmps SYN2 with Balanced outputs > h9000 analogue XLR inputs. I also have it all hooked up over ADAT with a MH2882+dsp box – which works great. My db25 analogue connection needs some TLC, so far not used)
I will test it and get back to you – hopefully we find the solution which can help other users
ps: while we are on the subject of sensitivity doe you have a good URL about the ADSR and Envelope settings on the “SHAPE” knob for say Chorus?