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Right - Record. Latching switch.. Pressing a second time stops recording. Centre - Play. Momentary switch. The Payback uses a clever little logic circuit to begin playback as soon as you stop recording. Left - Play trigger. This is pretty cool, lets you play the loop for as long as you keep your foot on the switch, making for fun bursts of sample. The loud click lets it down though. Tapping and releasing this switch also functions as the stop playback switch.
The EQ knob sets a pretty radical filter. The EQ sounded a bit different on the breadboard and needs slightly reworking to balance the centre setting, but my stripboard is caked in duct tape so it will have to wait. The LED setup works pretty well on my design, with a tri-colour RGB common annode LED wired to turn red while recording and flash green at the start of every loop cycle. The Green cathode is sent to pin 25 of the ISD as shown on the stripboard layout.
The Blue cathode is unused. The power LED dims slightly as the Downsample is turned clockwise. This could be a lot of fun. I also like the idea of an input volume, allowing the signal to get clipped and distorted while recording.