Hi 洪光復, you need a special adapter, if your external microphone has a TRS-plug, because your "HTC One M9" only supports the TRRS-plug. I've more details for you, but the space here is too small. Please contact me: H.Pfitzinger@gmail.com
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10.2 Bug fixes Earlier: •Android 15 to 4 •Seamless recording across files •24Bit files with Android≥6 •Monitor latency of 20ms achievable •Play slider movements in real time •USB devices start Field Recorder •FFT full screen •Realtime spectrum •More class-compliant USB audio interfaces •192kHz/24bit processing •105dB in 16bit files •Homescreen widget •Direct FTP upload •Parametric recording equalizer •File list has signal envelopes and play •low-cut filters