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FamiTracker
I've compiled a spreadsheet of the pitch table values FamiTracker currently uses, and the Hz frequencies they translate to. Do with it as you will.
Edit: I have discovered that the VRC6 saw is systematically off by 1 in FamiTracker's playback (but not in exported NSFs). So... these tables apply if you use P7F on the saw channel (or no P/P80 in an exported NSF). (Bug report here: [url=http://famitracker.shoodot.net/forum/posts.php?id=2978]http://famitracker.shoodot.net/forum/posts.php?id=2978)
Nope, but you can use Pxx to get any possible pitch relative to this pitch table, so if you're determined you could make microtonal music with FamiTracker. (Nobody's done this yet, I don't think. I've been considering it.)
So how can i apply microtuning stretching compressing? Making all notes come closer to each other. Be it so that all notes from any octave comes closer to the middle octave so that all notes are exactly the same if 100%. Or all notes compresses to their own octave center.
I'm not sure what you're asking. There are a large number of meaningful ways to build a scale. But as I said, FamiTracker only has one built in (the usual 12 tone equal tempered one). If you want to use something else, here's what you have to do:
1. Generate your own table of tuning that meets your own requirements.
2. Convert those pitches to NES pitch table values.
3. Find the nearest values in the FamiTracker pitch table.
4. Use Pxx on every note to adjust the FamiTracker pitches to your own pitch table.
Alternatively:
1. Generate your own pitch table with 12 notes per octave, making sure things that are close to equal temperament line up with their equivalents.
2. Compose your song in FamiTracker's regular equal temperament.
3. Export to NSF.
4. Replace pitch table in the NSF with your own pitch table.
You can find whatever other info you need at: [url=http://nesdev.com/]http://nesdev.com/ (Or you can just reverse the formulas in the spreadsheet I posted.)
I'm not going to give any advice on how to make a scale though; that's a big topic.
Also for the change to the table is inverse what you put in Pxx, i.e. P7F means use the table value + 1. (For FDS it is backwards though.)
So, generally what do you use this data for? This is an area of sound/music that I just sort of brush over but I know it is probably more important than I think.
Tuning, if you care about it. That's really about it. Since FamiTracker doesn't have custom tuning tables, inspecting the pitch table and carefully applying Pxx is the only way to use other tuning systems.
Anyhow, equal temperament is pretty useful. Most people never try the alternatives, and that's okay. People have been putting Pxx commands in their NSF Import covers, but every NES game I know of actually uses equal temperament, they are just tuned to a slightly different pitch (i.e. not A-440), so I don't think that's really an interesting distinction to make.
The interesting things you can do are use other tuning systems, like just intonation, meantone, or other equal divisions of the octave, or a wide variety of other things. I've attached a really simple test of a true harmonic series. (Note the rock-solid waveform in the visualizer, rather than the usual fluttery thing you get with equal tempered chords.)
Edit: I've added a second pattern with the same thing in equal temperament so you can compare.
I've always thought tracking programs should allow just intonation. After all, equal temperament is a compromise that makes real-world instruments easier to design and play, but does almost nothing to make computer music easier to compose. All that would be needed is a command to recalibrate the frequency table according to a certain note.
But I know such a feature will never be added to FamiTracker, so I'll settle for having a table of what Pxx commands to use for just intonation given the note to base the scale on. I'd put such a table on the wiki... only thing is I don't know offhand how to calculate the Pxx values.
Yeah, the only thing is there's not a whole lot of accuracy to play with. No matter how you slice it, the higher octaves are going to be roughly tuned, and this will stand out more in just intonation (maybe).
Interesting, but I prolly won't fool around with this too much. I knew something was wrong with VRC6, I kept thinking it was my ears failing me because I was spending too much time on Famitracker. What a relief lol.
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I don't know what the question is, but "applying just intonation" isn't something that can just be done with a button press in any situation. It requires a carefully chosen scale and a composition that uses that scale properly. A lot of music is written with the expectation that, for instance, D-sharp and E-flat can have the same meaning, but in just intonation they necessarily become different pitches, and you need to know which one you've got in your scale to use it effectively.
FamiTracker has always had microtonal tuning via Pxx but without knowing the pitch table there was no way to accurately apply it.
It might be nice to have an editable pitch table with a few functions for creating some commonly used scales w/parameters. It's not a feature I'd request, personally, since I doubt many will want to use it, and those who are gung-ho enough can get it via Pxx (or hack FamiTracker).
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