latigid on

Not sure I understand fully. You adjust the trim pot to get the scaling as linear as possible, i.e. the trimmer should be set so each octave step is as close as possible to the target voltage. Then you use the SEQ encoders to finely adjust for each volt setting. The DAC can't drive negative bits, so there is a limit to the lowest setting. But the remaining octaves should be very linear. Did you already see @Hawkeye's video on the calibration procedure?

Sounds like it could be a software bug, in which case the following thread is the place for it: http://midibox.org/forums/topic/13137-midibox-seq-v4-release-feedback/?page=61

One other idea: you could try plugging directly into the 407v board (mini USB cable). Here is the schematic, maybe some of the jumpers are helpful? https://www.waveshare.com/w/upload/5/58/CorexxxV-Schematic.pdf

Some Mouser parts have longer lead times at the moment. Here's a few suggestions: 595-SN74HC595DR -> 595-SN74HC595D (just non-reel packaging) 490-SJ1-3535NG -> 490-SJ1-3535NG-BE (blue) 594-K104K15X7RF53L2 -> 75-1C10X7R104K050R 806-KCDX-5S-S2 -> reichelt https://www.reichelt.de/din-socket-5-pin-semi-circular-printed-version-mabp-5s-p11178.html Conrad https://www.conrad.de/de/p/cliff-fm6725-din-rundsteckverbinder-buchse-einbau-horizontal-polzahl-5-schwarz-1-419666.html CR1206-JW-331ELF SMD resistors just use a 220R or 71-CRCW1206330RJNEAC WP154A4SUREQBFZGW Kingbright LED, tricky to find a frosted one, but basically any generic CC RGB LED will do, or a bicolour 3-pin is fine but normally not available in "nice" green. *** Feel free to post your suggestions or if you can't find a part.

There's a few settings in the HWCFG to check e.g. (search "fast") # the speed value for GP encoders which is used when the "FAST" button is activated: ENC_GP_FAST_SPEED 3 # Auto FAST mode: if a layer is assigned to velocity or CC, the fast button will be automatically # enabled - in other cases (e.g. Note or Length), the fast button will be automatically disabled ENC_AUTO_FAST 1 # the speed value for the BPM encoder which is used when the "FAST" function is activated ENC_BPM_FAST_SPEED 3 Can you check if altering these changes things to your liking? Of course, some features might have been "broken" by hard-coding functions. In the Wilba SEQ version, there was one common fast button, no matter what encoder was pressed. In the v4+ we have all of the encoders on dedicated DIN inputs (matrix) to allow for different customisation.

The v4+ does nothing different to your previous method: the ID pin is grounded when in OTG mode and floating otherwise. Maybe check pin PA10 is correctly grounded on the wCore PCB/breakout? Cabling issue or missing contact through the 2x25 pinheader? Perhaps the value for R3 on the USB board is too conservative and 100R would be better.

Hi George, I'm not 100% on how it all works and could be wrong, but to my knowledge you shouldn't see any MIDI data on the computer from the slaved device plugged into USBA. So my first guess is that you should unplug the computer; you can't (or shouldn't be able to) have the SEQ as both host and slave at the same time. You could then check the SEQ MIDI monitor and route it out a different DIN port. Second thought is that the controller (which ones, so we can consider making a whitelist?) does not initialise properly. Best, Andy

Green and gold! We're keeping track here: http://midibox.org/forums/topic/20885-midiphy-seq-v4/?page=23

Your connections are unclear; do you use the buttons in a matrix or directly connected to DIN pins? For direct connections, one common wire must be connected to 0V (ground), not to a digital input! Switches then trigger when the inputs connect to 0V. Matrix wiring is more complicated and you have to arrange the buttons and LEDs (electrically, not necessarily layout-wise) in grids.

I suppose you mean an AOUT with MAX525? What app are you testing with? The SEQ has a calibration part too. But first, have you adjusted the trim pots to give a good scaling factor? The DAC with external reference outputs a voltage between 0-2.048V with graduations of 1/4096. The gain equation is also on the page.

Nice, and good to know!

Hmm, breaks the MIDI standard a bit :) Sorry about your switches! It must be possible because the BLM can start and stop the SEQ, but that is in a compressed/non-standard format. I don't think it's anything simple and would need some firmware hacking but I guess it's possible.

All that MIOS cares about is the position of the respective register in the chain. You can also run parallel chains of DIN/DOUT (no mixing in this case) by attaching three IDC plugs on the ribbon that attaches to the Core.

You should be able to set the SEQ to slave from a MIDI start stop message? Or maybe I don't understand your question. But no, I don't think it's possible to assign a CC as a start/stop, at least not without recoding/hacking something.

@mfk your skills will be just fine! All of the parts are huge by SMT standards and several builders have completed even with no prior DIY experience. And, as Peter says, there's actually a fair amount of THT there too :)

Wow, was very nicely written and explains everything well. Thanks for the heads-up!

:-)

Well done #28!

No waiting list! There might be a teaser soon but it's hard to guess timelines at the moment. Hopefully there'll be something to tease shortly. Best, Andy

Awesome work, thanks for the update! Your serial number is waiting :)

Did you change the device ID to 1 when flashing the .hex? You should be able to communicate with the Core that way. Or how did you upload the .hex file?

What is the device ID printed on the PIC? Maybe the two both have the same ID and hence communication only works with one of them? You can try to disconnect the known-working one and see if you get input. If you need to change the IDs there's an app (.hex) for that that you upload with MIOS terminal. Thereafter reload your program.