Trembo Tremolo - Pending Tremolo.
JMP = JUMPER WIRE
VTL5C1 = optical isolator.
Control is KNOB and RATE.
Trimmer is to adjust the OPTICAL LED intensity.
LED beside trimmer is on-off indicator, connected to LFO to blink according to the LFO rate.
Familiar eh....pm me to know which TREMOLO this is modelled after.