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04-25-2021, 01:19 PM
Hi NGW
Really what you have is two cascaded FX loops where the second is a dedicated reverb block.
As Makinrose suggests, the reverb mixer should be redesigned as a proper mixer. This allows getting rid of the anti-parallel reverb control and using a simpler normally-oriented level control for the reverb output. Its mixing resistance can be low from the pot wiper into the mix triode, just as you need a low mixing resistor value from the input of the pedal.Set the reverb pedal to 100% wet.
Since the goal is to switch the send of the external FX loop AND to have remote control of the loop, do all the signal switching with relay contacts and move any panel switches to the relay coil control circuit. I don't see the point to S4 as it is wired as one of its positions makes RLY1 nonfunctional. In this context, one relay pole will switch the Send jack tip, tying it to the Send pot wiper or to ground. The second relay pole ties the input of the Send pot to the tip of the Return jack, but...
This is where there is a snag in the series loop. The output impedance of the effect is likely low and this loads the return jack node as far as being able to mix the effect input signal with the effect output signal, The obvious solution is to add a proper mixing stage here. Do you really need the CF? If the Send pot were a higher value and/or isolated from the preceding level control with a resistor, then the CF can be re purposed. The series-R into the Send control is functionally required anyway if the loop is strictly for pedals.
Ideally a CF would be positioned after the Send pot and drive the send jack directly as this maximises the benefit of having the CF. FX switching would be at the input to the CF.
Have fun
Really what you have is two cascaded FX loops where the second is a dedicated reverb block.
As Makinrose suggests, the reverb mixer should be redesigned as a proper mixer. This allows getting rid of the anti-parallel reverb control and using a simpler normally-oriented level control for the reverb output. Its mixing resistance can be low from the pot wiper into the mix triode, just as you need a low mixing resistor value from the input of the pedal.Set the reverb pedal to 100% wet.
Since the goal is to switch the send of the external FX loop AND to have remote control of the loop, do all the signal switching with relay contacts and move any panel switches to the relay coil control circuit. I don't see the point to S4 as it is wired as one of its positions makes RLY1 nonfunctional. In this context, one relay pole will switch the Send jack tip, tying it to the Send pot wiper or to ground. The second relay pole ties the input of the Send pot to the tip of the Return jack, but...
This is where there is a snag in the series loop. The output impedance of the effect is likely low and this loads the return jack node as far as being able to mix the effect input signal with the effect output signal, The obvious solution is to add a proper mixing stage here. Do you really need the CF? If the Send pot were a higher value and/or isolated from the preceding level control with a resistor, then the CF can be re purposed. The series-R into the Send control is functionally required anyway if the loop is strictly for pedals.
Ideally a CF would be positioned after the Send pot and drive the send jack directly as this maximises the benefit of having the CF. FX switching would be at the input to the CF.
Have fun
