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Thanks to these specifications, any device that is equipped with sound sources supporting the General MIDI System will be able to accurately reproduce General MIDI Scores (music data created for the General MIDI System), regardless of the manufacturer or model. □What is the GS Format? The GS Format is a standardized set of specifications for Roland's sound sources which defines the manner in which multi-timbral sound generating units will respond to MIDI messages. The GS Format also complies with the General MIDI System. The GS Format also defines a number of other details. These include unique specifications for sounds and the functions available for Tone editing and effects (chorus and reverb), and other specifications concerning the manner in which sound sources will respond to MIDI messages. Any device that is equipped with GS Format sound sources can faithfully reproduce GS Music Data (music data created under the GS Format). GENERAL miDi Any product carrying both the General MIDI and GS logos can faithfully reproduce the song data carrying either logo. □Standard GS Features Number of Parts: Maximum Polyphony: Tone Specification: 16 24 voice minimum Tones are selected by a combination of the usual Program Change message and a Control Change message. This is so the Tone selection method will be compatible, even if you’re talking about different models or devices. Drum Sets: Switchable with Program Change messages Effects: On-board Reverb and Chorus, independently adjustable for each Part •The Most Notes You Can Play At Once (Maximum Polyphony) When we say “notes" here, what we are really counting is the number of “voices." A voice is an internal circuit that can make whatever sound it’s told to make. The SC-33 has 28 such circuits, i.e., 28 voices. It depends on theTone, but some use up only one voice, and some are combinations of two voices. What this means is that you can play up to 28 notes at once with a Tone that uses only one voice.. .or 14 notes at once if the Tone uses two voices. And everything in between. Now, let’s say you’ve already got all 28 voices going at once (playing different Tones and notes), when some new data comes in saying “OK, now play this note too." Something’s got to go and the 76 GS Format has something called a “Voice Priority" ranking for each Part to help make sure that the impending 'voice-stealing-’ won’t completely disrupt your music. When a new note comes in that would cause you to exceed the maximum polyphony, Voice Priority helps decide what Part will lose its voice. Naturally, the lowest priority Parts should be the first to go. So when writing music, be sure to put the most important things (like melody) in the higher priority Parts. Voice Priority Ranking 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Part 10 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 About Tone Variations Here we'll explain how to use the Variations on the SOUND Canvas. •Tone Variations •Switching Variations 1112 13 ... 16-6 16-716 8 Tono number There are 128 basic sounds on the SOUND Canvas which can be switched using the Bank and Number buttons. These basic sounds are called Capitals. Tones that are similar to the Capitals, but differ slightly in terms of tonal nuance and feel, are called Variations. The Capitals are assigned a Variation Number of 0, whereas the Variations themselves are assigned numbers between 1 and 127. The relationship between Tone number (Bank/Number) and Variation number is shown in the diagram above. Not all Variation numbers have Tones assigned to them, and if there is no Tone assigned to a given Variation number, you will be unable to select that number on the SOUND Canvas. Check the “Tone Table” (»*■ page 87) to see which Tones have what Variations assigned to them. The method for switching Variations on the SOUND Canvas is different for Single mode and Multi mode. Check the descriptions below for what to do in each case. ♦ Switching in Single Mode In Single mode you can freely select Variations and Capitals. For some Tone numbers (Bank/ Number), when you have switched to a different Tone number after selecting a Variation, you can then set a Capital or Variation without regard to the previously selected Tone. When you select a Variation, the name of that Variation is displayed and the in the Tone number display goes out. ♦ Switching in Multi Mode In Multi mode, a Variation is specified for each Part. After selecting a Variation fora specific Part, if you then switch Tones forthat Part, you will get the same Variation number in the new Tone. However, if you have selected a Tone that does not have a Variation at that number, you will get the Capital as a substitute. 77 ■ Correspondence with Program Change Messages The Program Change message numbers sent from an external MIDI device correspond to Tone numbers on the SC-33 as follows: Bunk 1 i 3 4 5 6 7 8 Number 1 1 9 17 25 33 41 49 57 i 10 18 26 34 42 50 58 3 3 II 19 27 35 43...