The Alternative Csound Reference Manual
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# ctrl21

ctrl21 -- Allows a floating-point 21-bit MIDI signal scaled with a minimum and a maximum range.

## Description

Allows a floating-point 21-bit MIDI signal scaled with a minimum and a maximum range.

## Syntax

idest ctrl21 ichan, ictlno1, ictlno2, ictlno3, imin, imax [, ifn]

kdest ctrl21 ichan, ictlno1, ictlno2, ictlno3, kmin, kmax [, ifn]

## Initialization

idest -- output signal

ichan -- MIDI channel number (1-16)

ictlno -- MIDI controller number (0-127)

ictln1o -- most-significant byte controller number (0-127)

ictlno2 -- mid-significant byte controller number (0-127)

ictlno3 -- least-significant byte controller number (0-127)

imin -- user-defined minimum floating-point value of output

imax -- user-defined maximum floating-point value of output

ifn (optional) -- table to be read when indexing is required. Table must be normalized. Output is scaled according to imax and imin val.

## Performance

kdest -- output signal

kmin -- user-defined minimum floating-point value of output

kmax -- user-defined maximum floating-point value of output

ctrl21 (i- and k-rate 21 bit MIDI control) allows a floating-point 21-bit MIDI signal scaled with a minimum and a maximum range. Minimum and maximum values can be varied at k-rate. It can use optional interpolated table indexing. It requires three MIDI controllers as input.

ctrl21 differs from midic21 because it can be included in score oriented instruments without Csound crashes. It needs the additional parameter ichan containing the MIDI channel of the controller. MIDI channel is the same for all the controllers used in a single ctrl21 opcode.

## See Also

ctrl7, ctrl14, initc7, initc14, initc21, midic7, midic14, midic21

## Credits

Author: Gabriel Maldonado
Italy

New in Csound version 3.47

Thanks goes to Rasmus Ekman for pointing out the correct MIDI channel and controller number ranges.

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