Or just create multiple presets-- one for each song with pre-saved tempo. I play to a click track, and I have all my delays saved with specific BMP settings. I have generic non-tempo-specific delays in some presets, and some have exact BPM settings to have the desired delay effect (like U2).
I think... less things to connect, less things can go wrong. :) And sorry, have not explored MIDI on the Helix yet.