home *** CD-ROM | disk | FTP | other *** search
- IDPLAYER NEWS #3 March 1986
-
- Welcome to the third news file for Sidplayer. This document describes how to
- use POLYCON, the polyphony conversion utility.
-
- The polyphony effect occurs when one sequence of notes is played alternately
- on two voices. For example, voice one plays the first note, voice two plays
- the second note, voice one plays the third note, and so on. This allows each
- new note to start playing while the previous note is still fading away, for a
- pleasant, continuous sound. The effect is heard at a few places in the song
- HOMECOMING and in most of the song FUER.
-
- The POLYCON utility converts a song so that the notes in one voice are played
- with the polyphony effect. To do this, it copies the notes in the one voice
- to a second voice that is not being used, and then changes every other note to
- a rest. The first, third, fifth, etc. notes on the one voice will be changed
- to rests, and the second, fourth, sixth, etc. notes on the other voice will be
- changed to rests.
-
- To convert a song, load and run the POLYCON utility. Enter the name of the
- song to be converted, and wait for the song to load.
-
- The source voice is the voice which contains the notes that are to be played
- with the polyphony effect. When prompted for the source voice, enter the
- number of the voice which has these notes.
-
- The entire voice may be converted, or only the notes in a specified range of
- measures. Enter the number of the measure where the conversion should start,
- or just press the Return key if you want the conversion to start at the
- beginning of the voice.
-
- Next enter the number of the measure where the conversion should end. The
- conversion will stop at the beginning of this measure. For example, if you
- specify that the conversion should stop at measure 50, the notes up to measure
- 50 will be converted, but those in measure 50 will not be converted. Press
- only the Return key if you want the conversion to continue to the end of the
- voice.
-
- If you do not convert the whole voice, and enter a number for the beginning or
- ending measure, or both, the voice must contain corresponding measure markers
- with the same numbers. The POLYCON utility searches the voice for these
- measure markers to find where to start and stop the conversion. If the
- measure markers are missing, the program will report an error.
-
- The program next asks you to specify which voices are to be used to produce
- the polyphony effect. Press the Y or N key to specify yes or no on each voice.
-
- The polyphony effect requires that two voices be used. The source voice can
- be one of these, so be sure to type Y for the source voice.
-
- The second voice should be one that is not in use - not playing any notes -
- while the polyphony notes are being played. If you are converting an entire
- voice, this second voice must be empty. If you are converting only a range of
- measures, the second voice should be playing only rests during those measures.
- Decide which voice will be the second voice, and type Y for that voice number.
- Type N for the remaining voice.
-
- If the conversion is being done on a range of measures, there must be
- corresponding measure markers in the second voice as well as in the source
- voice. The utility will report an error if it cannot find the starting and
- ending measure markers in the second voice.
-
- Any notes, rests, or commands between the measure markers in the second voice
- will be deleted and replaced with the polyphony notes.
-
- After you have responded with Y or N for each voice, the utility will perform
- the conversion and ask you if you want to convert another part. Type Y to
- repeat the above procedure, possibly using a different source voice.
-
- When you are done and do not want to convert any more notes, just type N at
- the prompt asking if you want to convert another part. Then enter a filename
- and wait for the program to save the converted song.
-
- You may need to go back to the Sidplayer Editor and add slower release rates
- to the polyphony voices to make the polyphony effect more noticeable.
-
- Also remember that you can always use the Editor to examine someone else's
- song to see how some of these advanced techniques are used. For example, you
- may want to look at how polyphony was used with detuning for an interesting
- effect at the beginning of the song ISLAND. Polyphony also creates a nice
- effect on fast arpeggios; it does not have to be used just with slow notes.
-
- The polyphony effect can also be done using three voices. Just type Y for
- each voice when prompted. Be sure that the two voices other than the source
- voice are not playing any notes during those measures when the polyphony
- effect is desired, as those notes will be deleted by the utility and replaced
- with the polyphony notes.
-
- The POLYCON utility has one other use besides converting a song for the
- polyphony effect. If you specify that you want polyphony on only one voice,
- and that voice is the source voice, the program will print an error message,
- because polyphony can not be done with only one voice.
-
- If the polyphony voice is different from the source voice, however, the
- program will only print a warning message that a non-polyphonic arrangement
- has been selected, and will then duplicate the specified range of measures
- from the source voice to the polyphony voice without changing any notes to
- rests.
-
- This can be useful occasionally when you want to have the exact same sequence
- of notes on two voices. One application is when you want to use the advanced
- technique of having two voices synced together with the TPS value changing
- every few notes. It is a lot easier to just duplicate the notes than to
- define and call several phrases, each phrase being only one or two notes long.
-
- As a final comment, remember that once a part of a song has been converted,
- there is no easy way to undo the conversion. It may be a good idea to keep a
- copy of the song without the polyphony effect.
-