Attempting AUX recordings from my old phones

 For a while I've tried ripping audio from my Huawei U3900 through its 3.5mm headphone jack. It's a little tedious to get the setup working but I managed to get audio of my Yamaha MA Sound Demo 035 MIDI transcription playing on its CMX bank.

Audio

The buzzing is coming from my cheap PC's aux jack, so it doesn't sound so good.