Are you sure of that?
Did you try sending audio through it as well?
Is that audible?
Audio in dosent work.
Just tried again with audio and LFO from the Brute and Iām positive : thereās no audio going thru, only cv mod.
Thanks for testing:
Thatās quite brilliant actually!
errrā¦ I have an opposite experienceā¦
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Which TD-3 have you? I have the red one.
Quite soon weāll realize the blue has a reverb instead of a distortionā¦ 
I wish it were so, since Iāve got not much with a303 through a ds-1.
(Btw: Iāve got a blue one)
Yes, and?
Both you and the manual are wrong. (!)
The Filter in is not a CV in, itās definitely and audio in. Also, the audio doesnāt replace the internal VCO, it adds to it (not āinstead ofā).
I should add that, for me, the fact that the internal VCO is not silenced when thereās audio at filter in makes this feature a bit useless.
I read something about setting the vco switch between square and saw to silence it.
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that would be greatā¦ will try.
@thomaso, youāre right !
Crappy pattern as example:
TD3 with Manis iteritas at filter in (fade in)
TD3 with only Manis Iteritas, TD3 VCO switch between sqr and saw
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Well, I made a video : the filter in acts as both an audio in and mod in. When I tried earlier I didnāt know the TD-3 had to be playing note to let the audio go through.
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Very odd behaviourā¦ canāt reproduce it with my own lfo. Will have to investigate this tonight.
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Are you using TS or TRS. Manual says TS. TRS wonāt werk.
TS, standard cable I use from my A-145
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I use a TRS. Thatās a cheap hack 
Upon further testsā¦ I can confirm the filter in is an audio in. However, the filter has a different response given the sound source gain (be it internal or external). When a control rate signal (LFO, enveloppe) is applied at filter in it is added to the internal VCO and changes itās gain, which effectively modulates the filter frequency. This is certainly not a clean CV input, but now I can see how it can be abused as a it.
TD3 with LFO fading in:
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