Hi,

If you own an A-127, then you that it can be changed from band pass to
low pass with internal jumpers.

Now: If you have an A-127 Version 3 (the version is written on the
pcbs), then it is also possible to get a high pass signal too. You
simply have to feed pin 14 of IC1 to the center pin of the selection
jumper; you can pick this signal at the right side of R15, which is the
resistor direct aside the unused trimmer P8. One cable nothing else!

Btw: the A127 is a hidden gem as it provides in fact three SEM filters!

Florian