Output a tempo synced LFO as MIDI CC values. You can scroll through 4 different rhythmic subdivisions with an expression pedal. (1/2, 1, 2x, 3x).
You can modify the subdivisions on page 2

The patch can receive tempo as an incoming tap tempo (Left stompswitch) and/or from a MIDI clock. The MIDI clock will always override the Tap tempo, but you can temporarily mess with the MIDI clock on the fly using the tap tempo.