Ngokusekelwe kwisisombululo semakrofoni ye-electret condenser yomthengi, i-Aopuxin iqalise isisombululo sovavanyo se-one to two ukuphucula amandla ovavanyo lweemveliso zomthengi kumgca wemveliso.
Xa kuthelekiswa negumbi elingashukumiyo elingenamsindo, le nkqubo yovavanyo inomthamo omncinci, osombulula ingxaki yovavanyo kwaye uzisa uqoqosho olungcono. Inganciphisa neendleko zokuphathwa kwemveliso.