The Sub Pro can isolate individual strings or groups of strings. These can then be routed to two outputs. In this example the 'B' string is isolated and sent to the first output. The other five strings are sent to the second output of the Sub Pro.
The B string is pitch-shifted using an Electro Harmonix pitchfork. This pedal has the option of plugging in an expression pedal enabling a glissando effect. I decided to use a Roland DP-10 which is really a keyboard sustain pedal but makes so much sense for this kind of setup.
When the pedal is pushed down the pitch of the string is raised by one tone. I'm bending this note down by sometimes beginning with the pedal down and raising it up.
The signal from this one string is then recombined with the other five using a Boss LS-2, a very useful pedal, which amongst other things can be used as a two channel mixer.
This combined signal is compressed and then some reverb is added. Voilà!
To recap the signal chain is:
Sub Pro channel 1 (B-string) > Pitchfork > Boss LS-2>
Sub Pro channel 1 (Other 5 strings) > Boss LS-2 >
> MXR Studio Compressor > TC Electronic Forcefield > Expression > Walrus Audio Fathom > Fender Blues Junior