Timer Inputs – Relay inputs set to a timer now turn off when the time runs out instead of staying on until triggered again; set the input to ON / OFF if it must stay on
Park-Kill Horn – Steering-wheel horn now sounds the factory horn in park in every knob position; siren tones stay muted
Bug Fixes
Long Button Timers – Button timers over 65 seconds now run for the full time set, up to 9,999 seconds
Configuration Load – Relay no longer restarts over and over when it can't load its configuration; it stays connected so it can be reprogrammed with desktop app 1.1.37 or later
Park-Kill Horn Press – Horn press in HF while parked no longer starts a siren tone when the vehicle leaves park
Siren Firmware 6.1.0
Audio Playback – Voice messages and other recorded sounds no longer cut out several times a second
Siren Update – Install from the desktop app with Program Siren; requires a siren with a siren port
07/08/26 - v6.9.0:
Features
Button LED – Controller button LED no longer stays lit after ignition shutdown
Park-Kill Override – Amplifier now correctly shuts down during park conditions
Analog Input States – Input systems report only activation changes, eliminating spurious events
USB Connection – Improved reliability of device USB connection for configuration and updates
05/23/26 - v6.7.0:
Features
Controller: added configurable slide switch LED colors
Day-night: update button LED brightness behavior for all modes
03/16/26 - v6.5.0:
Features
Addition of Whelen-like wail and yelp to the siren
Add holdoff/debounce for multi-button output actions
Ensure synq relay can recover from fatal system errors
Update OOBE config to exercise wail 2 and yelp 2
Add overload detection with debounce and cooldown protection
Bug Fixes
Set manual input mode when playing/stopping channel 1 tones
Update figure 8 and night ride to have gradients
Analog mic mutes instead of stops siren tones
Prevent audible blips for manual tones during analog mic keying
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