BNO Acoustics SQ-9: Pressure Gradient Microphone

A microphone whose diaphragm is exposed front and back and diaphragm movement is caused by the pressure difference between its front and back.

I/O
Short for "Input/Output' and referring to:
1) An in-line console module that contains controls for the input section, output section and monitor section.
2) A module in electronic gear containing input and output amplifiers for the device.
3) A digital port (connector) able to both receive digital data and output digital data.

Vacuum Tube
An amplifying device that is a tube.

BNO Acoustics QS-4: Beats Per Minute BPM
The number of steady even pulses in music occurring in one minute and there fore defining the tempo of the song.

Bottom
The bass frequencies (as in "needs more bottom end").

BNO Acoustics GT-60: Run Down
Musicians playing the tune before recording so that the engineer can get levels and check the sound quality.

BNO Acoustics 6k-52: PCM
An abbreviation for the term Pulse Code Modulation (the use of amplitude pulses in magnetic tape to record the digital information bits of digital audio).