Antares ATR-1a - Manual (Page 14)

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If a performance is quite close to begin with and only requires minor
correction (i.e., never more that 50 cents), it’s often sufficient to simply
choose the Chromatic scale, set Speed to about 10 and leave it there.
If you are working in the studio to correct an already recorded track, you
might use Program Mode to deal with the track one section at a time,
stoping to change Programs between sections.
Song Mode
Song Mode offers a more elaborate set of controls primarily designed to
facilitate the use of the ATR-1a in a live performance situation, whether in
actual concert or during tracking in the studio.
The ATR-1a provides 20 Songs. For each Song, you can program a series of
up to 15 Song Steps. Each Step can contain a Program (with associated
scale) or one of a number of navigation controls (See Chapter 4 for
details). In performance you move from Song Step to Song Step via the
foot switch or MIDI. You can also call up different Songs via MIDI Program
Change messages.
Each Song also contains its own Speed and Vibrato settings that override
those settings in the individual Programs. In this way, an individual
Program’s scale can be used in any number of songs, each with different
Speed and Vibrato settings. (To accomplish the same thing in Program
Mode would require you to create multiple Programs, each with the
identical scale but with the different Speed and Vibrato settings. Very
inefficient. )
There is of course no hard and fast rule for which mode to use in any
particular situation. Try out both modes and use what feels comfortable
to you.