Owner, Disaster Area Designs and Alexander Pedals
We're sending a control voltage (CV) signal to the Belle Deluxe's expression port. The range of delay times is not perfectly linear but it's close enough for what we want to do, so the tap function works well. We can set the tempo to roughly a 2 millisecond resolution which is not ideal but we're limited by how the BED resolves the pot position anyway.You're talking about the expression pedal pot as long as it changes across the sweep it's fine. The BED side just sends current and gets current back, based on the difference between the two it sets the delay time. The gen3 will approximate the value to send back, it might or might not be accurate. Does it have to be exactly on the money?
The BED is also kind of an odd bird in that it wants to see the CV on the ring of the jack rather than the tip. To accommodate that, I designed in a couple of options that let you use either the tip or the ring of the MultiJack for sending the CV. That will let you control stuff like the Old Blood Noise Black Fountain and Mondegreen that expect the signal on the tip.
The setup on the SMARTClock itself is pretty simple - you set the "D" output up as CV Ring, then set CV min and max to the delay times you want to use. Once that is configured you just tap like normal, and the BED will follow along. You can even tap quarter notes and use the divisions option in the SMARTClock to set the delay time to dotted 8th, 8th, or triplets.
Interestingly we think that this same setup will also work on the El Capistan, providing a zero-modification external tap tempo option. Obviously you'll need to tell the SMARTClock which range of the El Cap you're in since the delay time varies but it beats drilling a hole in your $300+ pedal.