Turn your mono signal into stereo. The Hosa GPP-419 1/4 TS to 1/4 TRS Adaptor is a compact adapter designed for converting a mono phone plug to a stereo phone input. The Hosa GPP-419 is the perfect companion for any musician at home or on the move. The high-quality adaptor applies the mono signal equally to stereo left and right channels. Its compact yet rugged design ensures maximum durability.