So, do you create the patches on the xpression? Do the FX (delays, reverb,etc) spill over to next patch?
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Yes, I have programmed a bunch of presets on the Xpression...and of course I have programmed my RM4 to change channels accordingly as well. If you've been using stomp boxes all this time, you're going to love stepping on just one MIDI pedal and having your effects and amp channels change simultaneously.
The effects can indeed spill over from one patch to the next if you program them that way, but I have intentionally programmed my Xpression NOT to spill over. I'm trying to remember why I did that...I think when I was first programming the unit, I read in the manual something to the effect that if you enable the spill over, then the effects parameters from the previous patch carry forward and (temporarily)override those of the new preset -- and I did not want that. I'd recommend you download the Xpression's manual from the Rocktron site and read up on it. Anyway, despite the fact that I get no spill over benefit from the unit, I still think the Xpression is the best thing going in its price range.
The phaser to me is the unit's best effect, though it sounds different than a Boss phaser...I have even programmed a couple phaser patches to simulate wah wah effects. On the other hand, I think the Xpression's flanger is kind of weak....I have actually resorted to using the phaser when I need a flanger-type effect.
Gary