Doepfer A-127 Triple VC Resonance Filter - Manual (Page 11)

doepfer System A - 100 Triple VC Resonance Filter A-127
11
7. Appendix
Altering the filter characteristics
The characteristics of each of the indifividual filters in
the A-127 can be altered by changing the position of a
corresponding jumper on its three-pin connector on
the filter circuit-board.
The standard factory setting is for each of the filters to
be set to the bandpass position (labelled "BP").
You can, if you want, alter the response of each
individual filter, so that it is 12 db low-pass.
Versions 1 and 2 of the A-127 module:
Change Jumper J1 on the filter circuit board from
position "BP" to position "LP" (low pass) - see Fig. 6.
Version 3 of the A-127 module:
Change the position of Jumper JP5 on the filter circuit.
JP5 is located behind der filter output socket.
Even a toggle switch can be added to switch between
low pass and band pass for each filter.
fig. 6: A-127 filter circuit-board
(versions 1 and 2)