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Ah yes, it's complex.  I think I should do a video to show the process!  It'll be the easiest way.  Can you wait a day or 2 and I'll post a link with the process.

I'll list the process below too, but I think the video will clear things up.

Tutorial Video: https://youtu.be/s6l-9iKFtDo

Tune Freq V/Oct Input
1)  Connect the V/Oct source (e.g. MIDI to CV converter) to Freq 1V/Oct input
2)  Turn function knob to Coarse Freq
3)  Turn value knob to 0
4)  Input 1.25V into Freq input.  Using a Doepfer A-190-2, this is an Oct 3 E flat.  However I am aware that different modules use different voltage offsets. Message me if you are unsure about your module.
5)  Press and hold the function knob and value knob until function knob flashes
6)  Turn value knob to 1
7)  Input 3.75V into Freq input.  Using a Doepfer A-190-2, this is an Oct 5 A (natural).
8 )  Press and hold the function knob and value knob until function knob flashes
9)  Turn value knob to 9
10)  If you input an Oct 4 A (natural), this should output 440Hz from the Oscitron.
11)  Repeat if still out of tune.  If still out of tune after 3 attempts, then email info@soulsbysynths.com

Tune Filter Freq V/Oct Input
1)  Connect the V/Oct source (e.g. MIDI to CV converter) to Filter Freq 1V/Oct input
2)  Turn function knob to Coarse Freq
3)  Turn value knob to 2
4)  Input 1.25V into Freq input.  Using a Doepfer A-190-2, this is an Oct 3 E flat.  However I am aware that different modules use different voltage offsets. Message me if you are unsure about your module.
5)  Press and hold the function knob and value knob until function knob flashes
6)  Turn value knob to 3
7)  Input 3.75V into Freq input.  Using a Doepfer A-190-2, this is an Oct 5 A (natural).
8 )  Press and hold the function knob and value knob until function knob flashes
9)  Turn value knob to 9
10)  With the resonance on full, you should hear the filter cutoff track in tune with the oscillator frequency.

Sure, no problem.  Could you email me at info@soulsbysynths.com and let me know the serial number. Then I'll go through the best method for getting to me for repair.
cheers
Paul

At the moment it's just the same as the mini software, with identical mapping.  I'm going to upgrade the mini software and do proper release of Odytron with all params on CCs early next year.

Yes - if you haven't saved over the internal patch, this is the best way to do it.
If you have saved over the internal patch, here's the settings for the default patch:
Waveform 0
Filter 1
Filter Envelope 1
Amplitude Envelope 2
LFO  type 0
LFO speed 5
Wavecrush/Portamento 0
Pattern 1

Filter Cutoff 255/255
Filter Envelope 255/255
Filter LFO 0/255
Amp LFO 0/255
Distortion 0/255
Filter Resonance 140/255
Pitch Envelope 0/255
Pitch LFO 0/255
PWM 0/255
Phaser 0/255
Volume 60/127

I would be interested to hear an audio clip of this problem.  I may be able to work out what's going on.  Some of the filters do breakup, especially with the high resonance settings.  However the standard ones (filters 1,2,3,4) should all be totally stable.  Obviously filter 0 (off) should be totally fine!  I'm wondering if a slightly loose pot would cause this sound - if it was continuously sending out noise-like data.
I load and verify the software on each Arduino before shipping, but there's always a possibility that there's an issue with it. I've not come across it  myself as yet though. 

It's D0 for MIDI in and D1 for MIDI out. 

Hmm, no I don't think these methods are related, although they both use AVRdude to transfer the data.
The Anode seems to use an ATtiny chip which is programmed to communicate with the AVR chip in the Anode.  I don't think it uses the Arduino bootloader.
The Atmegatron uses an FTDI cable to communicate with the Arduino bootloader directly on the Atmega chip.
Similar but slightly different methods to achieve the same result.  Sadly no compatible kit though.

Just to confirm - the unit has stopped receiving MIDI upon booting up?  You've not just done a software upload?  This is very strange.  You've checked that other synths can receive the MIDI signal?  Checked programmer switch is to the right (when viewed from above)?  Switch it a couple of times to make sure it's all the way to the right.
I'll start with the obvious ones first before going deeper!

Yeah the Arduino comes pre-hacked.  PC and Macs will recognise it as a standard MIDI device.  It can still be used as an Arduino too by popping a jumper on a header (which is included - details in the instructions).

 

Thanks

Hi Raimee,
Can I check whether you are wanting to do this for the Atmegatron or miniAtmegatron?  Solution is slightly different for both.
Thanks for manual info.  Yes, there was an error in V1 of the manual and I still had that version on the website.  I've updated it now.

I'll have a play and see if I can get it to do it as often.  I've definitely seen the problem before, but it only happens rarely, not at all with the lower numbered filters. But yes - low cutoff + high resonance is the situation that can initiate the problem. It's the scenario that requires the highest resolution of the floating point maths.  There's always a possibility that a change I made between versions has had a knock-on effect with the filter.

Interestingly I've just developed a fixed point maths version of the filter for the new Eurorack module.  I could do a version of that for the Atmegatron.  The maths won't crash, but the down side is there's some stepping in the sound at low cutoff freq values and the 100dB filter isn't possible.  The joy of 8-bit!

I'll be relaunching it in a couple of weeks in time for Xmas.  Thonk now have them on sale too: https://www.thonk.co.uk/shop/soulsby-miniatmegatron/

Cool - sounds like the FTDI wasn't 100% happy.  Sometimes needs a restart after installation