volume control array channels xp opposite vista

when i run code:

mixerline mixerline;
memset( &mixerline, 0, sizeof(mixerline) );
mixerline.cbstruct = sizeof(mixerline);
mixerline.dwcomponenttype = mixerline_componenttype_src_waveout;
mmresult = mixergetlineinfo( (hmixerobj)m_dwmixerhandle, &mixerline, mixer_getlineinfof_componenttype );

under xp mixerline.cchannels comes behind array channels sound tag supports. mostly 2, days mostly more.

under perspective mixerline.cchannels comes behind one.

i have following removing mixercontrol_controltype_volume control sourroundings volume any channel supported, sourroundings volumne control opposite levels opposite channels vessel song behind leading between speakers (left right).

obviously underneath perspective proceed isn't operative given there wholly channel. i set volume both channels during same time.

i attempted mixercontrol_controltype_pan device, nonetheless current control.

so, doubt mmsystem experts this: form control i need adjust left/right balance? alternately, there improved way? i fortitude works both xp vista.

computer details: controlling perspective ultimta 32 bit sp1 latest patches. audio presumption artistic audigy 2 zs tag 4 speakers trustworthy morally addressed (controlled) by vista's sound panel. engineer latest creative's site (sbax_pcdrv_lb_2_18_0001). perspective sound set mono, channels visable controlable sound panel.

running way "xp harmony mode" does change intrepidity problem.