[sdiy] mixing poles

[Oakley Sound]

The old Oakley MultiLadder was a multitapped Moog ladder filter. The 
idea being that by adding and subtracting these outputs together one 
could get a variety of new responses.

I also used the same principle, but simplified, on the Oakley Filtrex 
and SuperLadder.

Also remember that you can add in the original input signal too so you 
can get other interesting notch and high pass responses. However, the 
Moog ladder is not the best way to get this since the passband gain 
changes with resonance settings. Cascaded integrators are probably more 
suited to it. It was certainly used to great success in the Xpander.

The complexity of all those interrelating coefficients made me 
rationalise the design for the SuperLadder module, so one pot pretty 
much selects one pole to four pole via 'band pass' in the middle.

Tony

www.oakleysound.com