Behringer Acoustic modeler AM-400 and Digital Delay/Reverb DR-400 input signal mod
The input signal circuit of the AM-400 and DR-400 are the same, try out the mod:
- Change the input capacitor 22nF to 47nF (for more bottom) and remove the pF capacitor after a 10K resistor (for more open sound), see the picture:
* This will help the AM-400 annoying hiss (white noise) problem, caused by increasing the attack button to compensate the lack of treble. By removing the cutting capacitor, you won't need to increase the attack to obtaining more highs.