[Tool]Pokitto Music Tracker

That is my experience also. Even two channels mixed sound much worse.
There could be a “clipping indicator led” in the Tracker UI. It would go full red when it detects clipping and then is gradually dimmed.

IT seems switching the amp off and on sounds worse than the beeping.

I will add a disable audio interrupt call

I wonder why one SD lib squeaks and the other one doesn’t. :thinking:

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You know there is cheese and squeaky cheese? Same thing.

(pops head around corner) Did someone say Cheese ?

(dutch guy, so I like cheeeeeeeeese)

Nice, I think i figured out how the tracker is intended to be used, but I believe the tracker is still a little buggy and not usable at the moment or maybe I am doing something wrong?

  • After selecting the binary from the loader the tracker starts with an empty pattern screen and the “pause icon” appears in the upper left corner.

  • Going into Play Mode © and pressing A (Play) seems to crash the machine, ever after inserting some note information.

  • Going into “More settings” and choosing save song seems to write something to the SD Card.

  • Choosing “Load Song” after that seems to crash the machine.

  • Loading the binary after a reset automatically loads some garbled pattern, not that this would be bad ;-), but trying to play that pattern again crashes the machine.

However, the song.rbs from jonne posted above seems to work fine. Can’t wait to test the tracker out further, let me know if I can be of help.

Hi and welcome to the board @gho !

The best way you can help at the moment is to try out things and report problems, as you have done.

If you find ways of crashing the program, that info is especially valuable.

Ok, while I am at it, it seems that on my device I am getting a bit of interference between the screen and the sound circuitry. On the tracking screen I hear a bit of inconspicious background noise, probably from the amps, but also a high frequency pulse signal. This pulsing becomes more pronounced in the instrument and saving screen. Is this normal? Not complaining here, just want to check that the device is working as intended. Am getting similar sounds in the Mode 13 demo.

The instrument preview feature with the envelope and all is pretty nice by the way.

Have you charged the device yet? There is some interference yes, but it should be less when the battery has more charge

Yes, the battery was low and I did not connect the screen properly, now it is much better! Did not expect the Berlin Philharmonics! :smiley:

I think I managed to produce a workable init.rbs. However, the instruments are not saved in it. Here is how it somehow works for me, just in case someone is having similar problems and wants to start tracking.

  • Load the attached init.rbs, it contains a few notes for instrument 1 in Track 1. Instrument 1 is empty, so you have to create one.
  • Go to the instrument screen, select patch 1, set Wave to square, Arp Mode to M Slow, ADSR to 1, Attack to 100, Decay to 100, Volume to max. 255 (careful!), press A and enjoy.
  • Go to the tracker screen, enter Play Mode © and press Play (A). You should hear a series of C Major Arps.
  • From here it is pretty much straight forward, create some instruments and start tracking.

Saving the patterns seems to work, but the instruments are not saved with it. Surely not a complicated fix.
Some other observations:

  • When the tracker reaches line 63 it does not jump back to line 1 correctly, but the playback is ok. It is just a display thing.
  • When the tracker is playing, there is still this acoustic click feedback for moving the cursor.
  • I find the autoloading on startup a bit confusing, I would prefer if it started with an empty track.
  • The B button for delete and Travel mode is maybe not the best choice, because leaving edit mode can result in deleting the note that one has just entered.

Otherwise it is pretty fine, once the saving of the instruments is fixed it is quite workable.

INIT.rbs (42.3 KB)


I will fix those bugs tomorrow. EDIT: I also was thinking maybe its not necessary to load the previous song automatically

Incidentally, did you know @gho that there is a PC tracker that can be used to make .rbs songs?

oops! I’ve forgotten to release it. Source will come up to github tomorrow.

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I have been waiting for this!

Ah, yes, nice to see that there is a PC tracker available, but for now I am prefering the Pokitto, because I am after that hardware sound.

Right now I have connected it to a mixer and am listening on monitors. The signal is quite strong. I have some nice square bass going here and the interaction between two instruments on the same step produces some nice crunchy timbres. Sounds very LoFi in a good way so to speak. Definately some material for sampling there too.

I also had a look around the github repository, specifically the tracker code. At least I understand a tiny little bit. Maybe the scrolling bug can be fixed somewhere between line 558 and 590 in Tracker.cpp? I guess that the screen pointer is not reset to zero after the first iteration through the pattern or something similar.

Am thinking about a little project to learn coding right now, will post more in another thread.

You Sir, talk my kind of language. You got the idea. If I had wanted clean sounds (aka “beep”) I would have stuck with square waves like Arduboy and Gamebuino. But I find the “crunchiness” of desperate attempts at saw & triangle waves more interesting.

Edit: one thing we will add eventually is sine waves and samples

Edit: and ring modulation

But lets get this thing mostly functional first

Edit : and midi support


Right on! It is a good strategy to get a solid foundation first and then work on the many possible improvements.

By the way, MIDI is nice, but it would be also nice and maybe simpler to allow for sync to an external analog pulse signal via GPIO, if possible. One has to make sure that one does not fry the Pokitto with too high voltages though.

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Thats what the GPIO is for. There are several analog ins

Hey @gho , @NullMember , @Hanski and others.

Here is a much improved version of the tracker

  • choice of new/load previous at startup
  • sustain fixed
  • ‘A’ toggles editmode / travel mode
  • saving instruments fixed
  • playback of empty pattern fixed, no more crash

Code updated on github


tracker.bin (89.9 KB)


Lo and behold! There were some bugs in the envelope & mixing functions!

We now have proper sustain and real bass

watch your ears!!


new binary

tracker.bin (89.9 KB)

(explanation) mixing routines were originally done with uint8_t values. Some of those still remained and although I migrated them to int32_t’s and such, the mixing routines were still written to use 8-bit values. Fixing those made envelope and pitch bend output alot better