Listening in loudness mode (front panel only), Direct playback (front panel only), Basic playback – Pioneer VSX-D908TX User Manual
Page 48: Press bass (–/+) to adjust the low frequencies, Press treble (–/+) to adjust the high frequencies, Press loudness, Press direct to put the receiver in direct mode, Each press switches loudness mode on or off, Vsx-d938tx loudness, Vsx-d938tx bass –/+ treble

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