/*
* Set an equalizer band value.
*
* Note: legal band indices range from 0 to 9 instead of 1 to 10.
*
* This method raises an Xmms::Error exception if XMMS is not running,
* or an ArgumentError exception if the band index is out of range.
*
* Example:
* remote.set_band 2, 0.5
*
*/
static VALUE xr_eq_set_band(VALUE self, VALUE band, VALUE val) {