|Changes in Revision 4
Most changes in the r4 were for ease of assembly purposes, but two new features were added:
Input Attenuator: Earlier versions often required use of an external VCA to reduce input signal levels and prevent overdriving the input. This is now handled by the input attenuator.
Output limiting: The output levels of earlier versions could spike well beyond Ã‚Â±5Vp-p, so an output limiter was added. The limiter has a soft to medium curve and can be disabled by moving the two jumpers as shown on the PCB.