The 7-series recorders show a preamplifier gain value on the LCD. This value is an approximation of the mic preamp gain. It is not an exact representation of input-to-digital signal gain.
Multi-channel surround sound recording has historically been a gear-intensive process, requiring a multi-track recorder and multiple microphones.
One tool used to reduce the complexity of surround recording is the SoundField microphone system.
The 302 and 442 mixer's tone oscillators have several modes of operation. From the Setup Menu, the tone frequency and level can be set.
Q: What does the polarity switch on a 302 do? Sometimes when I switch it I lose signal on channel 2. What is going on?
When using the 702T or 744T AES/EBU digital inputs and the built in time code generator to slave the recorders from a mixer with digital outputs, care must be taken. The 702T and 744T internal time code generator can only run off of its internal high-accuracy crystal - it does not use word clock or AES/EBU to derive time code.