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1

Software Showcase / Bassoon Tracker - online tracker in plain javascript

« on: June 22, 2017, 15:00:41 »

Ok, I think we're about ready for a first release:

Bassoon Tracker - a browser based tracker in plain old javascript.
Open, play, edit and save 4 channel mod files in your browser.

http://www.stef.be/bassoontracker/



It supports all Protracker effects.
Not all Protracker 1 and 2 weird playback quirks are implemented but most of them are.
It also performs well on mobile devices, but without a keyboard it's a bit hard to enter any notes ...
Of course the wonderful ModArchive API is implemented so you can access the archive directly from the tracker.

Source code is on Github: https://github.com/steffest/bassoontracker
If you finds any bugs or have any feature requests: let me know!

Steffest

2

Project / Coder's Corner / The Counting Riddle (sample offset question)

« on: June 16, 2017, 12:15:59 »

Hey,
I'm in the process of writing my own web-based tracker and have reached the muddy waters of tracker-variations.

My Question is about the "9" sample offset effect, especially related to special cases when notes and sample number are omitted.
I created a little demo mod that behaves differently in different players.

It's located at http://www.stef.be/bassoontracker/demomods/test/sampleoffset.mod

The sample is a voice counting from 1 to 4, depending on the sample offset and the handling of special cases, you get another sequence in different players .

I tested it on multiple trackers and there are 3 different ways the sample offset is handled:

• counting is heard as  2-3-2-3-3-4-4
  
  • Protracker 1.3 - Amiga
  • Protracker 2.3d - Amiga and the Windows Clone
  • OpenMPT
• counting is heard as 2-3-2-3-2-3-2-3
  
  • Protracker 3.15 - Amiga
  • Protracker 4 - Amiga
  • Milkytracker (even in Protracker 2 mode)
• counting is heard as 2-3-2-3-1-2-2-3
  
  • FasttrackerII - DOS
  • Milkytracker (in Fasttracker mode)

The problem is: I understand the 2nd and the 3th way, but I can't get my head around the logic of the first way (of Protracker 1, 2 and OpenMPT)
especially the note on row 32: this doesn't have a sample number, nor an effect but somehow the previous 9 effect gets applied twice? (the sample starts playing at "three")
Then after that, at row 48, no sample number and "900": you hear "four"? why?

My own code follows Fasttracker here as this seems the most logical implementation (http://www.stef.be/bassoontracker/?file=demomods%2Ftest%2Fsampleoffset.mod)
but most .mod files seem to expect the PT2 way so I would like to get that right.

And even more a mystery: How would you know what playback variation the .mod files expect?

Anyone who has dug deep into this and wants to shed a light?

Update:
Oh, look at that, I found a 4th way ...
XMPlay with the the "PT1" playback mode does "2-3-2-3-2-3-3-4"
How balls-on weird is that?
puzzling ...