SM v2.0

Internal volume control settings have been altered to accommodate the new, 10 dB higher audio gain. Also pilot tone is now disabled in standby mode.

SM v1.8

On some units and then only occasionally, a 15 kHz whine is added to the audio after using an RM remote control to "wake" the transmitter from standby. Sleeping and waking the unit or powering the SM off and on would correct it. This and later versions remove the vulnerability.

SM v1.5

Added "mode 6" and remote control capability (for RM product).

SM v1.3

Fixed bug where pilot tone was sometimes missing at power up. Transmitter RF no longer radiates while selecting compatibility mode.

SM v1.1

Added standby mode and added countdown to lock/unlock functions.