Remote control volume control delay

Hi,i have Arylic up2stream 2.0 v3 amp modul with remote control,i wanna ask any solution for upgrade or fix user experience for remote control mostly volume up and down,when i press and hold volume up or down i always have delay of maybe one second before volume start to react and after that start with hi speed to go up or down without linearity,any chance with UART comands to change behave of speed and linearity of volume control with remote ir control?
Thanks

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