Hi Spud,
I'm not quite sure that you're understanding what this mod should do (sorry if you do - just need to clear this up), so let me back up a bit. With an older delay pedal, say an old Ibanez AD-8, if you were playing with some heavy delay and abruptly stopped playing and bypassed the pedal, the repeated notes would trail off
after you turned the pedal off. With true bypass, that does not happen because the entire circuit is bypassed. This mod was worked out for those who miss those trailing repeats when the pedal is bypassed. Also, this mod is constructed so that SW1 (bypass) acts as a master "true" bypass for the pedal, and SW2 (meant to be a footswitch) acts similar to the way an old Boss or Ibanez does it's bypass. When SW2 shorts the 15K resistor out of the circuit, it effectively acts like a non-true bypass pedal does.
Spud wrote:
Do you short the 15K to ground to get trails? As in, if you short it, you stop any further signal entering the delay path and only keep the repeats that are there?
Yes - sort of. You don't short it to ground, you simply break the connection.
Spud wrote:
OR....Do you bypass the 15K as with this diagram
No. Nothing gets connected to lug 3 on SW2.
Spud wrote:
I have my trails switch wired as per the original mod drawing (again, ignore the led side of things as I have this sussed) but I only get a delay effect when I turn the switch to "trails on"! I.E. When the top two poles on the left of the original mod drawing are connected. If I turn the switch so that the bottom two poles on the left are connected, I.E....one end of the 15K is lifted but not connected to the PCB, I get NO delay effect, just a dry signal.
As I have it wired (as per the original mod drawing, not the one I have posted) if I turn the pedal off, the trails stop with the pedal so in effect ('scuse the pun
) the mod does not work in my case.
It sounds to me like you have everything wired correctly but are using the mod incorrectly. Let me say it this way:
SW1 ON = Effect is in your effects chain.
SW1 OFF = "Master Bypass" /Effect is being bypassed completely. Bypassing effect while playing cuts all repeats off immediately.
SW2 ON = Normal operation, delay is happening.
SW2 OFF = "non-true bypass"/Delay circuit is bypassed, but trailing repeats are allowed to "exit" the circuit. Your signal is still being routed through the buffer portion of the circuit, but not into the delay portion of the circuit. Bypassing effect while playing will allow repeats to "finish off".
Do this to check that it's working: set your delay knob to the longest setting and repeats to near maximum. Hit one note on your guitar and turn off SW2. You should have the repeats from that one note keep repeating until they're "finished", but any notes played after bypassing via SW2 will not add to the repeats. That's all this mod does.