[watch]

This is how i did it in the end, just some test code i thought id post it for reference as it could be useful for anyone who searches for something similiar as a later date

#include <amxmodx>
#include <amxmisc>
#include <fakemeta>

#define PLUGIN "fm_mute"
#define VERSION "1.0"
#define AUTHOR "watch"

#define SPEAK_MUTED 0
#define SPEAK_NORMAL    1

new g_maxplayers 
new g_playermute[33][33]

public client_connect(id)
{
    for (new i = 0; i < g_maxplayers; i++)
        g_playermute[id][i] = SPEAK_NORMAL
    g_playermute[0][id] = SPEAK_NORMAL
}

public client_disconnect(id)
{
    for (new i = 0; i < g_maxplayers; i++)
    {
        g_playermute[id][i] = SPEAK_NORMAL
        g_playermute[i][id] = SPEAK_NORMAL
    }
}

public plugin_init()
{
    register_plugin(PLUGIN, VERSION, AUTHOR)
    register_forward(FM_Voice_SetClientListening, "mute_forward")
    g_maxplayers = get_maxplayers()
    register_concmd("mute", "mute")
}

public mute_forward(receiver, sender, listen)
{
    //client_print(0,print_console,"%d %d %d",receiver, sender, listen)
    if (receiver == sender)
        return FMRES_IGNORED

    new name[32]
    get_user_name(sender,name,31)
        
    if (g_playermute[0][sender] == SPEAK_MUTED && listen == SPEAK_NORMAL)
    {
        client_print(0,print_chat,"%s is muted globally %d %d %d", name, receiver, sender, listen)
        engfunc(EngFunc_SetClientListening, receiver, sender, SPEAK_MUTED)
        return FMRES_SUPERCEDE
    }
    else if (g_playermute[receiver][sender] == SPEAK_MUTED && listen == SPEAK_NORMAL)
    {
        client_print(0,print_chat,"%s is muted by player %d %d %d", name, receiver, sender, listen)
        engfunc(EngFunc_SetClientListening, receiver, sender, SPEAK_MUTED)
        return FMRES_SUPERCEDE
        
    }
    return FMRES_IGNORED
}

public set_client_listening(receiver, sender, listen)   
    g_playermute[receiver][sender] = listen

public mute(id)
{
    new args[33], target[32], listen[2]
    read_args(args,31)
    strbreak(args,target,30, listen, 1)
    
    new player = cmd_target(id,target,0)
    if (!player) return PLUGIN_HANDLED
    
    set_client_listening(id,player, str_to_num(listen))
    
    console_print(id,"done")
    return PLUGIN_HANDLED
}

public set_speak(id,listen)
    g_playermute[0][id] = listen