Posted By
Chicken
on 2016-01-23
16:01:59
 |  Re: Convert a GoatTracker tune to TED ?
Just some little additions …
As Csabo mentioned above, in plus/4 scene lingo the two types of converters are called "freq. converters" and "wave converters". These may not be the most accurate terms but these are the established ones.
For SID support: Even better than just copying $D400-$D41f is to modify the original player to access $FD40-$FD5F (or $FE80-$FE9F) directly. Otherwise, you might introduce some unwanted effects. Furthermore, some SID cards do not support the original C64 clock frequency. So the music will have a different pitch when played on plus/4.
There is also another (though rarely applied) technique: SID tunes can be "pre-converted" with a special frequency converter. Thus, you and up with a really fast TED-player. However, I don't know if there's a dedicated program for this job. And I recall only one program using this method: Vector Victory converted by Csory.
Another option which I haven't seen (or heard  ) very often: You can also use a freqency converter (or in this case: rather a SID to TED converter) and leave out the frequency conversion part (which takes some cycles) and modify the frequency table in the original (SID) player instead. This requires some knowledge of the original player, though. It's used in most parts of Magic Inspiration.
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