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- tracker is a soundtracker player for sparc or silicon graphics
- machines.
- To build it, just use the appropriate makefile.
-
-
- tracker is a public domain program, it is not guaranteed to do anything
- at all, either useful or useless. Do with it as you will, but
- use it at your own risk.
-
- ``Soundtracker'' is a family of music composition programs
- that exists on the amiga. The resulting data files (modules)
- have been appearing on ftp sites for some time now.
-
- For a machine with sufficient horsepower and some audio capability,
- it is possible to emulate the amiga audio hardware in real time,
- and play those modules.
- After that, you're only limited by the machine's capabilities. The
- sparc is a bit poor (as a 8K machine), in contrast with the indigo,
- which gives an almost perfect rendition of most modules.
-
- This release of tracker supports most amiga soundtracker file formats,
- and plays most of the existing effects, so that about 95% of the modules
- are output correctly.
-
- There is no man page (write it yourself), but a short description of
- the options can be obtained with tracker -h.
-
- Here is some supplementary information.
-
- Environment variables:
- OVERSAMPLE can be used to control the acurateness of the reproduction.
- (It is the number of samples used to output one audio word).
- The higher, the better, but the more CPU it will use. The default
- value (1) is quite good at high frequencies, but not so for, for instance
- a poor sparc station's 8000 Hz. You can try, say, 2 or 3. After that,
- there won't be any noticeable improvement, and anyway, the program won't
- be fast enough to keep up with the output rate.
-
- FREQUENCY can be used to set the audio output at a specific frequency
- (if the hardware supports it). The hardware will decide which frequency
- to actually use, according to other external parameters.
-
- MONO on the sgi can be used to force mono output, which uses less
- cpu power.
-
- TRANSPOSE is the number of halftones to transpose each note (>0 is higher).
- Useful for low frequency sparcs which can't play some tunes accurately, or
- when you get bored...
-
- Most of the switches are here for compatibility reasons. As there
- are billions and billions.. wait, wrong series. As there are lots and
- lots of soundtrackers clones out there, they are not *quite*
- compatible with one another. Mainly, there was an old format and a
- newer format.
- You can force one of these formats by either renaming your command
- to ntracker or otracker, or you can use the -n and -o switch to try
- reading a file as a new tracker file, or an old tracker file.
- The default is to try first the new tracker format, then revert to
- the old tracker format (switch -b for both).
- There is also a speed problems. Most trackers use some timing which
- is dependent upon the powerline frequency... 60Hz in the states, 50Hz
- in Europe. Most modules have been composed in Europe, so the default
- is 50Hz, but you can set that speed to 60Hz with -s60.
- (Incidentally, you can try and speed up a module to amazing speeds like
- -s200, just for fun).
-
- The -f switch is not really there to be used, except if there is a
- module you really can't play, then try -f2.
-
- The -r switch is obvious (I hope).
-
- The -m value is a mix value. In real-world stereo, you hear each side on
- the other side, at least a bit. With headphones, this effect disappears,
- unless you mix a bit of each side on the other side.
- 0 is spatial stereo (not for headphones), 100 is mono.
- A reasonable value is 30. The perceived change tends to be logarithmic,
- interesting values would be 30, 70, 85, 90, 92, 95...
-
- Finally, the program itself is reasonably smart, you can use it as a
- module jukebox by giving a tracker * -like command line, then skip from
- one module to the next by sending a signal 2 (usually ^C) and aborting
- altogether with a signal 2 (usually ^\). It recognizes also modules
- packed with either compress or zoo... Adding your own compression method
- should be easy. It is also fairly difficult to crash, because tracker
- modules are notorious problem files, with lots of formats problems.
-
-
- The original idea of the tracker was by Liam Corner, back when it
- was called str32, but there is precious little left of his original
- code (if any of it). I must admit, I would never have had the idea
- (nor the courage) to start that project all by myself.
-
- You can do what you want with the source code, though I would suggest
- that Liam and myself be cited if you add anything to it.
-
- Send bug reports to espie@ens.fr,
- encouragements and nice things to espie@ens.fr and zenith@dcs.warwick.ac.uk.
- --
-
- Marc Espie, Paris, december 11th 1991.
-