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Looper's Delight
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>>What's a "throttle pedal"?<< like in a car. I was thinking, after writing the original mail, that for tempo adjustments on the fly, you want something like a pitch-wheel that springs back to a central position, & knocking it either way briefly would adjust the tempo. a tiny bit of adjustment in a sort of dead-ish area near the centre of the pedal's travel, with the adjustment getting more extreme at the ends of the pedal's travel. if you've used a pitch-wheel on a synth, you'll know what I mean. my particular challenge is that there are three of us in my band, & it will most likely always be three, + the occasional guest. as bass/drums/guitar with electronics, we use a lot of pre-fabricated parts in looping midi sequencers (the sequentix p3, a doepfer maq) aswell as parts in the repeater. the drummer doesn't like clicks or flashing lights & in any case, we all think that for the music to be able to "breathe", we don't want quartz-locked BPM. tap tempo is fine, but by the time you've started to hear the sequencers & loops lagging the drums slightly, you also need to slip them aswell as make the tempo correction. the solution is to accelerate briefly to a higher-than-required tempo so that the midi clocked parts catch up to the drummer, then relax back to the new higher tempo. same goes for slowing things down. & you need to do this with a single, intuitive control that works by being kicked while you're not looking at it or concentrating on it especially hard. I would therefore most likely design a centred foot pedal that looks like a half-open wah/volume pedal & is sprung to settle in that position. either side of this, it uses midi CC to raise or lower the tempo around a relatively insensitive zone (like our synth pitch-wheel) but which at both ends of it's travel would also have a PC switch to make a permanent change to the tempo. obviously, the various values for CC & PC would be determined empirically..... ah, projects..... :-) d.