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Alembic SF-2 Clone (single channel):

It is a rotary switch (4 positions) for routing the input signal: Effects, Normal, Series, Parallel. Like the original.

Comparison:

I built these pedals.

I'm currently testing this board:

Damnation Audio MBD-1 Clone

Markbass Little Mark II Preamp:

A smaller version of the Peavey Century Preamp:

Original and Preamp-Clone:

Dunwich Volt Thrower clone

Peavey Standard 260 Series Preamp: 2-Channel Preamp: Channel 1 "Effects" and Channel 2 "Normal". A rotary switch can be used to choose channel 1 or 2, or channel 1 and 2 parallel or in series

The EQP is a zerofive audio LowRider clone.

From big to small:

I traced a JLO HyperDrive and used a 125B enclosure: