Index index into a table with a signal

Index.ar(bufnum, in, mul, add)

Index.kr(bufnum, in, mul, add)

The input signal value is truncated to an integer value and used as an index into the table.

Out of range index values are clipped to the valid range.

bufnum - index of the buffer

in - the input signal.

// indexing into a fixed table

(

{

SinOsc.ar(

Index.kr(

LocalBuf.newFrom([ 200, 300, 400, 500, 600, 800 ]),

LFSaw.kr(2.0).range(0, 7)

),

0,

0.5

)

}.play;

)

// with mouse control

(

{

SinOsc.ar(

Index.kr(

LocalBuf.newFrom([ 200, 300, 400, 500, 600, 800 ]),

MouseX.kr(0, 7)

),

0,

0.5

)

}.play;

)

(

// indexing into a changeable table

s = Server.local;

t = [ 200, 300, 400, 500, 600, 800 ];

b = Buffer(s, t.size, 1);

// alloc and set the values

s.listSendMsg( b.allocMsg( b.setnMsg(0, t) ).postln );

SynthDef(\help_Index, { arg out = 0, i_bufnum = 0;

Out.ar(0,

SinOsc.ar(

Index.kr(

i_bufnum,

LFSaw.kr(2).range(0, 7)

),

0,

0.5

)

)

}).play(s, [\i_bufnum, b]);

)

b.setn(*[ 200, 300, 400, 500, 600, 800 ].scramble.postln - 30);

(

SynthDef(\help_Index, { arg out=0,i_bufnum=0;

Out.ar(0,

SinOsc.ar(

Index.kr(

i_bufnum,

MouseX.kr(0, BufFrames.ir(i_bufnum))

),

0,

0.5

)

)

}).play(s, [\i_bufnum, b]);

)

b.free;