Just amazed at this!
This morning is the first I’d heard of the project and it’s super impressive work.
If you did make a case it would be cool if it was angled so the Digitakt sat on top at a similar degree to the IKEA Isberget stands.
p.s. count me in!
If the breakout board could be mounted inside then I’d settle for a DN25 connector. It would be nice if there was room for it on the back panel but if not either side would do.
Thank you for expressing your interest and excitement! It serves as the fuel I need to make progress on this 
I have not disassembled a Digitone but I suspect there is not much space in it. If there is, a DB25 version will not be hard to make.
I took some measurements today. After some tweaks to my code I was able to get the latency down to ~6.6msec. I believe the final version will be somewhere between that and 10msec (if I find out that 6.6msec is unstable). In comparison, my (admittedly out-of-the-box unoptimized in any way) Ableton installation on my 2018 Macbook Pro reports 57.6ms latency - but I am not sure if that is just Overbridge, or does other stuff like the onboard audio interface play into that.
Here’s a capture of the scope when I made the measurement today:
The top (yellow) trace is the Digitone master output and the blue trace is my board. Some things to note are:
I’m curious if these would be a deal breaker for those that have shown interest.
How do you feel about ~6.6-10msec of latency? Please note that since the board breaks out the master output as well, you won’t have any latency issues between sounds coming out of the Digitone if you only get them through this board. The latency will come into play when mixing with other equipment, but I am hoping that <10msec is acceptable.
This is what I’m seeing in Ableton when I hover on the Digitone plugin:
to check whether it is noticeable or not, i’d try to mix two tracks with percussive content in Ableton, and quicly swich the second track with a 10ms track offset and check if the groove feels noticeabily different.
Easy enough to add a track delay to keep things in sync. Considering the latency is far less than with OB, I’d say this is acceptable.
The inaudible distortion is probably high frequency ringing of the output opamp.
The damping capacitor on the feedback path need to be adjusted.
For good audio quality the power line should be as noise free as possible.
this works ITB only, though you also do need overbreidge, or an audio to midi sync box to keep the sequencers in sync.
OTB you could have the digitone playing percussive parts in sync with an analog drum machine, so latency could be an issue, unless you have a dedicated Sync clock box that is able to offset the clocks like the ERM multiclock.
great project, was thinking whether it is possible.
as for the space inside digi boxes - there is a enough, one can even fit a batterypack inside to make it standalone
https://www.elektronauts.com/uploads/default/original/3X/d/8/d844f70d57674da3292b5ecc615e69a94f9a33ec.jpeg
if mounting inside there could be taken advantage of internal 12v power for more output headroom
yea, good idea for a check. Just did this.
The 6ms to 9ms range would be ideal. At 10ms it begins to become noticeable.
That kind of looks like parasitic oscillation. Did you use small caps in your op amp feedback paths for the analog side?
Oops, just noticed someone else mentioned this as well.
Worth checking though.
I’m in
Amazing work! A compact portable hardware solution to get individual outs from my DT would be amazing, I would certainly be interested 
So cool. Think i already responded in the thread but i no longer have a DTone, thinking of getting a DTakt though and if so this would be very cool. But i still maintain i´d want to solder it myself, more fun that way. Unless some really complex IC´s are there is could be pretty simple.
Not so many components either. What bothers me is fitting it into the machine. I know i can handle it myself but it could be disastrous and will of course void warranty if one does not have the right tools and skills.
Just because of this, i would prefer an external box instead of messing with the internals, if you´re not knowing your stuff. The elektron people will not be very happy either i guess. 
God no 
Pull all 12 cables all the time whenever you want to jam in the garden.
I really hope this comes to full fruition! I’d prefer this over OB any day! My only other option would be to buy a DNKeys, and I don’t need the keys!
Thanks again for the comments everyone!!
I made a recording of a few configurations to demonstrate where things are, I hope this is helpful to give perspective on the current performance: DT Breakout by Eran Rundstein | Free Listening on SoundCloud
There are four recordings, all going through my Mackie 1642VLZ3 and recording using a Motu Ultralite mk3 using Audacity. Only post-processing applied is Audacity’s normalization with its default settings. The sounds I used are factory DT sounds. Kick is “Thug Kick SM” and snare is “Class Snare SM”.
Please let me know if you want me to try any other stuff.
Thank you for those who are trying to help with the analog design - that is very welcome. Here’s the output stage from the DACs:
I am without access to my workshop for a few days so I won’t get to experimenting with different capacitor values until that is resolved, but would of course love to hear any feedback or suggestions for things to try out.
Those caps seem reasonable actually. I typically use 22pF to 100pF for those purposes depending on op amp and function.
Are C11 and C15 for AC coupling? If so, you could try 22uF there. Might generate slightly less distortion.
Also, if you have an account on Muff’s or Electro-Music there are tons of helpful people in the DIY forums. Some are absolute experts in these fields. I’m fairly experienced, but some of those guys are wizard level.
Yup, C11/C15 are for AC coupling. I haven’t spent much time on electro-music but I have been reading random posts on Muff’s DIY forum throughout the year. Good idea, I can post there. A thing I want to try doing before I do that, once I find the time, is to try and write code that plays a sine or square wave through the DAC, removing the DT/USB from the equation.
That’s a good idea. A small internal diagnostic/calibration would be handy!
Count me in for a box. Very willing to solder smd’s if needed. What an incredible project.
