After some requests for 'more fuzz', we developed a MOD for the Bass TightFuzz, which adds a hidden Boost Switch inside the battery door. The mod adds about 10 dB of additional clean boost to the front end of the Bass TightFuzz, so you can get gobs of fuzz even from vintage pickups.
The Bass TightFuzz has all the same vintage tones as the TightFuzz, re-tweaked for bass guitar by moving the Tight, Edge and Tone down an octave, and also includes our popular Dry Low knob which lets you add some dry lowend to blend with the Fuzz.
The most requested feature was the Germanium/Silicon switch, which changes the output stage from a softer, lower gain Germanium to a heavier, high gain Silicon transistor. This cool pedal also has the ability to get lower gain tones easily, with an Auto Bias that adjusts appropriately with the Fuzz control, to get the cleanest and nastiest distortions possible with one control. It also has an Edge switch with a Smooth setting to further knock the edge off, and a 60's/70's switch that transforms the pedal from tighter, lower gain 60's tones to fatter and heavier 70's tones.
One of the important differences between the Bass TightFuzz and most 'reissue' fuzz boxes is that with the addition of the Tight control in front of the fuzz circuit, the input of the fuzz circuit is effectively buffered from the bass....but in a compensated way. A common problem with the original fuzz designs is that circuits with low output impedances like those in overdrive pedals or from active basses, can completely change the bias and gain structure. The result is often an odd sound or squeals, unusual feedback etc. The buffering in the Bass TightFuzz simulates the impedance of a passive guitar, so that the fuzz circuit works in the normal way it's intended, and any low impedance circuit CAN be used in the loop or in front of the pedal.