Using BioAid is like focusing binoculars. With swissHear you can adjust gain in such a way, that a sound in front of you will be audible in the middle.
Adjusting input-gain: this gain influences the intensity of the signal used by BioAid. To much input gain will lead to clipping (parts of the signal are lost due to over amplification). Listening to hushed conversation in a room with low ambient noise can require high input-gain. Using the same gain in a crowd situation will lead to distortion. This parameter should be used symetrical to allow for symetrical transformation by the BioAid algorithm. Only differences in the microphone quality and position may ask for adjustments here.
Adjusting output-gain: basically this is a factor on the amplification of the signal after processing. To much Output-gain causes distortion and clipping. You may use these sliders to compensate different hearing capabilities. To find the ideal value move the spin-wheel to the middle position and then increase the value of the sliders until you hear a signal on both ears. Now you should be able to find a comfortable volume using the spin-wheel.