your technique for deep, clean sub bass

[k_k]

A sine wave is a pure tone - it doesn't have any harmonics. So you can't reduce or amplify "parts" of the sound.... you either alter the whole sound or nothing at all (i.e. your EQing was done at the frequency of your sine wave or it wasn't).

most sine waves you use in a synth wont be pure though

[magma]

As beez says, the subtraktor needs the filter all the way down. So does mean the subtraktor is not as good as I thought for sine/sub ?

Sounds like it, yeah... I've been using Subfreak (http://www.remixsoft.com/download/subfreak.html) lately, which seems pretty decent, but it'd be great to hear what other people are using....

Think I had a go on that a while ago.

Is it only for sub? can you modulate it etc

Yeah, it's reeaaaally simple. Just two oscillators.... one is a pure sine with essentially no options, and the second one gives you the choice of pure sine or a few variations, the ability to detune it and you can muck about with the Release on the Amp Env.

My only problem is that Ableton seems not to like automating it, even though it supposedly accepts MIDI... you can get some pretty funky modulations by just screwing about with the detune.