![]() The filter output proceeds to FUZZ LEVEL control R18, which feeds the output mixer/electronic footswitch stage (IC1C and IC4A-D). Also note that loop send jack J10 and loop receive jack J11 bypass the filter, thus letting you patch other types of filters or signal processors in place of the Quadrafuzz filter if desired. This two-pole lowpass filter provides additional control over the final sound, and seems to work well with guitar. The level controls go to a mixer (IC1A) which combines the signals together prior to feeding a tunable active filter (IC1D). Each filter output also feeds its own level control, so you can regulate the balance of the various frequency bands. ![]() LEDs also seem to clip in a somewhat gentler fashion than regular diodes, thus giving what is probably best described as a more “rounded” sound.Įach filter output can be individually tapped (note that these outputs are in phase with the master output, so you won’t run into cancellation problems if you use an external mixer to combine the individual outputs and master output together). These fuzz stages use LEDs rather than the usual diodes for the clipping (distortion-introducing) elements I did so because LEDs clip at a higher voltage, which allows for more output from each fuzz stage. ![]() The filter outputs then go to their own individual fuzzes, built around IC2A, IC2D, IC3A, and IC3D. The other filters include switches (S2 – S4) which allow for increasing their resonance (sharpness). The HI filter, IC3C, is tuned one octave higher than MID 2 but also offers a switch-selectable bandpass or pseudo-highpass response. The filter built around IC2B (LO) is tuned the lowest, the one built around IC2C (MID 1) is tuned somewhat higher, and the filter built around IC3B (MID 2) is tuned approximately one octave higher than MID 1. This preamped signal then splits (via R29 through R32) into four bandpass filters. At higher ATTACK settings, this stage introduces some broadband distortion of it’s own that is particularly useful for lead sounds. ATTACK control R52 sets IC1B’s gain from 2 to 200. IC1B is a preamp which accepts either a high level input (via J1) or a low level input (via J2).
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