1) "vnyl ctrl": When this item is checked, the audio file player expects to operate with vinyl/CD control, and you can't manually set the playback pitch. When this item is un-checked, you can manually set the playback pitch and control the playback of the file using the "play/stop" button.
2) "audio thru": When this item is checked, whatever audio signal is coming into the audio input channels to this audio file player will be copied to the outputs and you will hear it. This can be useful if you want to play a normal music vinyl record through your system, or if you want to listen to the Ms Pinky control signal coming in to verify that it is clean and free of abnormal distortions. Usually you will want to leave this item un-checked because you won't want to hear the Ms Pinky control signal in your output mix.
3) "file loop": When this item is checked, the audio file that is loaded will play in looped fashion... when it gets to the end of the file, it will automatically re-start at the beginning.
4) "file reverse": When this item is checked, the audio file will play in the opposite direction from what it would normally play given the pitch current pitch setting. Negative values of pitch will cause forward playback, and visa-versa.
5) "fat resample": When this item is checked, a high-order polynomial interpolation filter is used to adjust the pitch, rather than the usual linear interpolation filter. You can definitely hear an improvement in the sound quality with this setting, but it will also require more of your CPU.
6) "pitch lock": When this item is checked, you can change the speed of playback of the audio file without changing the pitch. This is also sometimes referred to as "time stretching". The algorithm we use for time stretching is a relatively simple time-domain method which produces some very characteristic artifacts, as do all time stretching algorithms. Whether or not you like the effect is your choice
