SyntherJack has introduced the 4sum – a portable audio mixer project, designed to be a companion for mini synths like the Korg Monotrons and Volcas.
Features:
- 4 mono inputs / 1 stereo (double mono) output with individual volume controls
- Long runtime (average 100 h)
- Small factor
- Beginner-friendly build.
SynthJack notes that “It’s a great companion for mini synths, like Monotrons and Volcas, and also makes a excellent first audio-related DIY project.”
Pricing and Availability
Details of the 4sum design are available on the SynthJack site. Full kits are available via Patch Audio for 210.00z? (about US $56).
56$ for diy kit? it’s a bad joke or what?
Seems like a pretty reasonable price for the kit– I mean it’s not outrageous. Are those 3.5mm mono jacks for the inputs and a stereo 3.5mm for output?
I wonder how this deals with signals of different impedance like guitars, vs line level. (I don’t really know what the Volca’s outputs are like).
A six or eight channel version of this would be great! I’m still on the search for an ideal mixer for my Pocket Operators and a slightly longer 6 channel version that could also distribute a sync out signal would be perfect. Mounting two of these cases: https://dichstudios.com/collections/po-gear/products/3po-case
together with a 6 channel mixer on the “hinge” would make for a nice portable Pocket Operator setup.
In the build style of the Groovisizer RED. Cool.
This looks like a fun and easy build that actually gets you something useful at the end.
it’s like a ‘monotron mix’. genius! might try it
The Volcas are stereo output and behave poorly when you short to mono (audio bleeds through sync cables). I would buy if the device could handle summing each input to mono.