by vermis_rex » Fri Feb 02, 2007 11:00 pm
The RFX-32 was a seperate FX upgrade board for the Ultra units. It can't be installed in the Classic units (and there are some issues with it's usability in the Ultra units).
The older effects board for the Classic units (model 6311, I think it was) just added fairly basic FX to the unit. It's the same arrangement as a lot of the Proteus units of the era: there's FX A and FX B, which can run seperately (parallel) or B->A (series). FX A was dedicated to reverb type effects. FX B added some chorus, flange, echo, delay and basic distortion. The effect parameters were very limited... it was really only useful for adding a little colour to otherwise lifeless samples. You'd get much farther (better control, more variety of effects, more simultaneous effects) with an external FX unit.
The filters... yeah, the morphing Z-plane filters were a big selling point of all E-mu products after the Morpheus synth module. The selection in the post-4.0 EOS is pretty good, with some powerful sound sculpting tools (although it lacks the third-plane filters that were in the Morpheus and UltraProteus modules). Whether automated with the LFOs or controlled in real-time, the filters kick ass.