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Q Is it possible to have four simultaneous voices? A Yes, you can have four simultaneous voices. Q What load do four voices place on the CPU of a 25MHz 68030 Mac? A Four voices are not a problem for a 25MHz 68030 Macintosh. On a Macintosh LC, we have measured approximately 30 percent CPU usage using 5 voices. Q Does the load level depend on the number of instruments used simultaneously? A Yes. The actual load depends on how many instruments are playing simultaneously. Q Can we build our own instruments? If so, is there a tool available for this purpose? A In QuickTime 2.0, there is no way to add user- instrument files. However, you can embed instruments into QuickTime movies. Future releases will add Musical Instrument Extensions to your system folder. Q Are the answers to all the above questions the same for the Windows version of QuickTime as they are for the Mac version? A On a Windows machine, the music in QuickTime movies plays through a sound card, with MIDI hardware support, using the MIDIMAPPER driver, with very minimal CPU load. Q Are the instrument sounds the same on Windows? A The sound of the instruments can vary with the sound card installed. Q Are most PC sound cards supported? A The music in your movies will play on any PC sound card that supports MIDI playback under Windows. [May 01 1995] |