Here is another pretty basic device that can be very handy depending on what you are doing.
It is quite simply a 31 band Real Time Analyzer. It consists of 31 Bandpass filters (set to a bandpass of 0.1 Octaves on ISO frequencies) and a 31 channel meter. This can be very handy when used in conjunction with the signal probe device, because it can show not only that there is signal, but it can also give you a general idea of what the spectral content of that signal is.
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RTA.npp
21.89 kb, 1272 downloads since 2012-12-10