advice needed on 5U left to fill

While I think the MULTIFX is great, you can do effects externally too. So I would get:

- DIVIDER (not BEAT DIVIDER)
- S&H
- NOISE
- LOGIC
- 3VCS

This will let you do crazy experimental things!

Of course if you're more into musical MIDI sequencing, etc. then I'd get the:

- BEAT DIVIDER (good for MIDI clock sync)
- DIVIDER
- S&H
- NOISE
- another 2ENV

Another 2ENV because you have 2 VCAs and two filters, so four “traditional” envelope destinations. But since you already feel that you’re too close to a traditional synth voice, then I would go all experimental with my first suggestion

Logic compares two gate signals and outputs high or low depending on certain conditions. For example it will only output high when input 1 AND 2 are both high. Like this you can set up conditions when gates will fire.

I have no idea of what you are talking about

Triq164 is one of my favorite modules.

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I would definitely add a 2/att or 4/mix  attenuator module, will instantly give you more flexibility as can set a range, moderate the level of modulation etc.  Be more musical or more bonkers! I have assumed the  4/Mix you have is usually tied up mixing the oscillators. 

I would echo others on getting another 2 ENV module, again increases your modulation possibilities dramatically. Ditto the noise module, to increase sound possibilities - pan pipe type sounds or Snare drums are hard to do without one, or you can do the Jarre noise filter sweep....

I personally would get another LFO, one is likely doing vibrato on the oscillators (2 if you want different rates), and one may be doing a trigger or gentle filter modulation; a 3rd means you can another modulation of a different rate on,say, the delay module.

The divider module would give you more possibilities too, in giving you another, adjustable modulation source (if feeding in a clock, could be midi). The beat divider would only be really helpful if you were doing sequencing in your AE. 

That's 5, but the multi-fx is brilliant if you are trying to keep the sound inside the AE modular.  You could drop the last 2 and get the Multi-FX instead... 

The logic module I use mostly to mess with triggers so don't feel would be as useful in your set up, but some people are using to get ring-modulator type FX so, as always, it depends on what you want to do.

If you intend sequencing at some point, a bigger case would be good - you could stick a seq16 module in there now and have a good time, if you do I would recommend the noise module with it as well for reasons mentioned above.