From the MAKE Flickr pool
Matt the modulator built a deluxe substitution box for experimenting with different resistor & capacitor values for circuit bending. Features include –
1. Resistance pots (4k7, 100k, 1m) 2. Capacitance – 12 caps selector poly 47-pf, 100-pf, 470-pf, 1-nf, 4n7 nf, 10-nf, 100nf, 1-uf, 1uf elec 1uf, 4.7uf, 10uf, 100uf 3. LED 4. Signal tracer simply a 1w amp maplin kit to trace audio signal in a circuit.
Have a closer look at the innards on Flickr.