TTL + 555 patchable soundmaker

3 X 555 timers - 2 audio-, 1 control- rate oscillators 1 X 74193 4-bit counter - frequency divider with LED indicators 1 X 74193 4-bit counter - with presettable clock start 1 X 74164 Serial-In, Parallel-Out Shift Register 1 X 7400 quad 2-input NAND gate - "mixers"