Daniel N. Flickinger introduced the first parametric equalizer in early 1971. His design leveraged the high performance op-amp of his own design, the 535 series (USPTO #3727896) to achieve filtering circuits that were before impossible. Flickinger's patent (USPTO #3752928) from early in 1971 showed the circuit topology that would come to dominate audio equalization until the present day, as well as the theoretical underpinnings of the elegant circuit. Instead of slide potentiometers working on individual bands of frequency, or rotary switches, Flickinger's circuit allowed completely arbitrary selection of frequency and cut/boost level in three overlapping bands over the entire audio spectrum. Six knobs on his early EQ's would control these sweepable filters. Up to six switches were incorporated to select shelving on the high and low bands, and bypassing for any unused band for the purest signal path. His original model boasts specifications that are seldom met today. [ citation needed ]
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When first using a USB memory immediately following purchase or formatting with the MGP32X and MGP24X, and after pressing the record button, a message such as “Storage Full!” may appear on the screen (depending on the USB memory), after which it may be impossible to use the USB recorder function. This is due to an error relating to the information on the free space in the USB memory immediately following purchase or formatting. If the information on the free space in the USB memory is initialized, it might take too much time for the mixer to analyze the amount of free space.
This error can be avoided by copying a file into the USB memory, or performing some other file operation on it, thereby updating the free space information.
When using a USB memory with the MGP32X and MGP24X, it is recommended that you first conduct the operation described above.
(If the abovementioned condition occurs)
Remove the USB memory from the mixer and turn the power off and then on again.
When you use the USB memory again, carry out a file operation on a computer such as copying a file into the USB memory.