The "space" stomp is a little closer, but it's weak for creating synth pad-like sounds. It's what I'm using for now, until I purchase a BigSky or the Kemper's updated. I would rather the latter so I'd have less on the pedalboard And thanks for the +1 on the reverb/delay topic.
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To reiterate on the controller/MIDI thing, my controller is arranged in groups of 4 patches per bank. Let's call them 1a, 1b, 1c, and 1d for bank 1, and for bank 2, 2a, 2b, 2c, and 2d, and the pattern continues up to bank 32 (giving 128 program changes). The program changes on the controller are sequential and cannot be adjusted to send anything different than what's built in. The Kemper's performance mode has 5 patches per song/performance. Those are triggered by MIDI program change 1-5 for the first song, 6-10 for the second song, and so forth.
If I configure song 1 to use all 5 patches, that means I have to bank up, select 2a, and potentially bank back down when done just for control purposes. For song 2, it now awkwardly starts on 2b, going up to 3b. That means a lot of bank switching. For song 3, it would be 3c-4c. Also, a lot of bank switching.
From what I can see, there's no way to tell performance mode that, if I wanted to not use one of the performance patches, to skip or reassign that missing program change. For example, if I didn't use the 5th patch on song 1, program change 5 just doesn't do anything, and song 2 starts with program change 6.
Not all controllers are 5 button. As a matter of fact, it doesn't even make sense, since the MIDI program changes are based on base 2 math anyway. It would be great to say "my controller only has 4 buttons, only utilize patches 1-4," which would give song 1 program changes 1-4, and song 2 program changes 5-8. An alternative would be to "compress" the performances, so that if a patch is empty, the next filled patch (whether that's the next song, or there's just an empty patch in the middle) would pick up from the next available program change number. And, the final alternative (and probably the best) would be the ability to just manually assign what program change the patches of each performance reside on, like you can for the full rigs in Browse mode.
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Finally, on the note of Rig Manager... holy crap yes.