The following tricks are for the Sony STR-DA4ES, STR-DA7ES, and STR-VA333ES. The receiver must be turned off before starting each one (unless noted): Demonstration mode: Hold Setup and press Power (button labelled "I/O"). Note: this also resets all of your settings just like a memory reset. Memory reset: hold down Power button for five seconds until message appears. confirm by pressing Enter. Flourescent Tube indicator test mode: Hold Display and Enter and press Power. Press Dimmer. All segments light up, then each lights in turn. Tuner Factory reset: Hold Setup and Dimmer and press Power. All tuner presets are cleared. SoundField Clear mode: Hold Mode+ and press Power. All soundfield parameters are reset to default. AM channel step size 9 or 10 kHz: Moving to from North America to Europe or vice-versa? Importing a foreign version of the receiver? Then you need to do this: Set function to AM and turn off power. Hold Tuning+ and press Power. Select desired step size. Display Firmware version and Model number: One of the most wanted tricks of all. Hold Surround and Enter then press Power. "Menu Specialized" is displayed. Press > to display model number, region code, and firmware version. The display is formatted like this: "D4ES U_CA VX.XX" where X.XX is the firmware version, U_CA is the destination code (USA and Canada). To display the firmware version and model number on the 3ES or 5ES, the steps are a little different: Turn on the power. Press the Enter and Surround buttons simultaneously. "Menu Expand" is displayed. Press > repeatedly to display the model and firmware version. The output is formatted similarly to the 4ES one above.