overcoming fixed feedback ratios for e.g. DL4

["Rainer Thelonius Balthasar Straschill" <rs@moinlabs.de>]

has anyone ever tried the following:

Take a DL4 and a volume pedal.

Go from your source to the DL4s left input

from your DL4s left output to your sink

from your DL4s right output to the volume pedal

and from your volume pedal back to your DL4s right input.

Now comes the tricky part:

Take one of the cables between DL4 and volume pedal (say, the pedal from
the DL4 to the volume pedal) and exchange the signal and ground wires on
one end.

My idea: the loop acts as a feedback loop in addition to the DL4
looper's internal feedback (which is preset to 0.9), only that it's
inverse feedback. So by having your volume pedal in the heel position,
you get 0.9+0=0.9 feedback. With the pedal in the toe position, you get
0.9-1.0=-0.1. And with the in-between positions, you get everything in
between, meaning no feedback over a little bit of feedback up to high
feedback values. Adding a switch to switch the polarity back on the
modified wire, you could even realize feedback values up to and in
excess of 1.