Digitone and AR2 both have this too. Does the MS? Mine isn’t here at the mo to check.
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I think all the Elektrons can do this apart from the cycles and samples
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Roland TB 303 has a mix in 
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Didn’t realise that ! Bit out of my price range though 
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The 606 and 303 were marketed together, so the thought was you run the 606 into the 303 and you got drummer and bass guitar player^^
They also made those nifty silver bags for the 303 and 606^^ For the portable musician 
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Looking around looks like the Uno synth also has this feature
Nord modulars. Even the tiny micro modular has a stereo input, which can be left dry or routed into madness.
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The Bodyssey, MS 1 and RD 8 have got mono inputs to their master buss as has the MatrixBrute and MB2S
Oh and the Novation UltraNova
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Even more to look into, thanks guys 
Analog 4. MS-20. Lyra8. DFAM. What synth doesn’t have ext. audio in?
Elektron Model series.
I was just responding to the earlier post about the NTS-1’s input routing. Plus it’s stereo, which is nice.
Just trying to help.
Lots of synths have audio in but not many can route straight to output which was the original question
Possible on Micron too
Almost none of the Sequentials.
sad
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Vermona perfourmer