Intallation
$ git clone https://github.com/jumbo5566/SRFRS
$cd SRFRS
Example
[root@allstar ~]# python srfrs.py version
SRFRS: INFO: Firmware version: 110U-V223

[root@alarmpi SRFRS]# python srfrs.py radio --frequency 438.500
SRFRS: INFO: +DMOSETGROUP:0, RX frequency: 438.5000, TX frequency: 438.5000, squelch: 4, OK

[root@alarmpi SRFRS]# python srfrs.py radio --frequency 438.500 --offset -5
SRFRS: INFO: +DMOSETGROUP:0, RX frequency: 438.5000, TX frequency: 433.5000, squelch: 4, OK

[root@allstar ~]# python srfrs.py radio --frequency 145.230 --offset -.6 --ctcss 100
SRFRS: INFO: +DMOSETGROUP:0, RX frequency: 145.2300, TX frequency: 144.6300, ctcss: 100.0, squelch: 4, OK

[root@allstar ~]# python srfrs.py volume --level 5
SRFRS: INFO: +DMOSETVOLUME:0 Volume level: 5
If you use an FTDI dongle to program the SRFRS module the USB port can be specified with the --port argument
[root@allstar ~]# python srfrs.py --port /dev/ttyAMA0 volume --level 5
SRFRS: INFO: +DMOSETVOLUME:0 Volume level: 5
Usage
This program has for sections:
radio: Program the radio's frequency, tone and squelch level
volume: Set the volume level
version: display the firmware version of the SR-FRS module
usage: srfrs [-h] [--port PORT] [--debug]

            {radio,volume,filters,version} ...

generate configuration for switch port

positional arguments:
{radio,volume,filters,version}

radio               Program the radio (frequency/tome/squelch)
volume              Set the volume level
filters             Set filters
version             Show the firmware version of the SA818

optional arguments:
-h, --help show this help message and exit
--port PORT Serial port [default: linux console port]
--debug

First change C:UsersAdministratorDocumentsArduinolibrariesSI4735-masterSI4735.h

/**
 * @ingroup group18 MCU External Audio Mute 
 * 
 * @brief Sets the Hardware Audio Mute
 * @details Turns the Hardware audio mute on or off
 * 
 * @see setAudioMuteMcuPin
 * 
 * @param on  True or false
 */
inline void setHardwareAudioMute(bool on)
{
    if(on){
    digitalWrite(audioMuteMcuPin, LOW);//Reverse the 27 MUTE pin connect PAM8406
    }else{
    digitalWrite(audioMuteMcuPin, HIGH);//Reverse the 27 MUTE pin connect PAM8406
    }
    delayMicroseconds(300);
}

then change SI4735_2.8_TFT_SI5351_V4.0_AQ1's code you like the SPEAKER work now
https://www.mmdvm.club/index.php/aq1.html