Volume in synths

[garyfitz123]

I wish to control the volume of my synth using a slider in a GUI. this is my synthdef so far:

SynthDef("fileplayer", { arg rate=1, mono, vol=0, buffer, pan, loop;
var file, files, filem;
files = PlayBuf.ar(2, buffer, rate, loop:1);
filem = Pan2.ar(PlayBuf.ar(1, buffer, rate, loop:1), pan);
files = Balance2.ar(files[0], files[1], pan:0);
file = Select.ar(mono, [files, filem]);
Out.ar(0, file);
}).writeDefFile;

I have set the output value of my slider to the vol variable, but when i move the slider, nothing happens.
Help please!
lol

[joshp]

can you post your slider code? When you say nothing happens, the reason is in that part of the code... so without it, not much we can help with.

josh