Setting the volume level of each channel, 1 press rcv, 6 press test tone to turn off the test tone – Pioneer VSX-D509S User Manual
Page 22: Preparations, Test tone is only output in dolby/dts modes, Levels can be set for each surround mode, The test tone is output in the following order, The channel level range is ± 10 db, Fl ct fr sr sl sw

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