First of all, loving my M9. Probably the wisest gear decision I've made thus far. It's straddling across two parallel/true stereo fx chains so I'm even considering getting a second one for more flexibility...
But I digress.
So yes, when I bought my M9 I already knew that the M Audio EX-P doesn't play well with M-Series pedals... but I don't understand why this is so, and whether I can fix the issue without having to buy yet another expression pedal.
Is the EX-P's design unusual? Does it need to be TS instead of TRS? Would it work if I rewired it to TS (mono) or added an adapter on the end of the cable to convert TRS to TS? Has anyone experimented with this?
Here is what I've discovered thus far about using an EX-P with an M9:
1) The Line6 M9 Pilot's Handbook states that "Expression Pedal 1 + 2 - Compatible with standard expression pedals including the Line6 EX-1 ... The Line6 EX-1 expression pedal is a passive 10k linear taper pot, using a standard 1/4 inch mono instrument cable."
2) The M Audio EX-P is a popular passive 10k linear taper pot expression pedal with a TRS output (ie. not mono) that I've had pleasant experiences with prior to buying the M9. Measured it on a scope to have an actual range from heel-down T-R @ 12.9k, toe-down T-R @ 1.0k (ie. 11.9k range). Also just in case it matters - heel T-S @ 53.9k to toe T-S @ 65.7k and heel R-S @ 64.7k to toe R-S @ 64.7k.
3) The M Audio EX-P doesn't work properly with the Line6 M9, as mentioned here:
http://line6.com/supportarchivenew/thread/19057/ and verified by my testing. The EX-P can be assigned to actuate parameters in the M9 but tops out/bottoms out early. It won't move the parameter for its full range. Eg. If I assign it to a wah FREQ it stops well short of maximum upper freq. If I assign it to MIX then it mixes neither fully wet nor fully dry. If I switch the EX-P polarity I have to re-assign the parameters but it behaves exactly the same.
Any ideas?
Cheers H