Covox Sound Master Plus: Add extra ports.

src/sound/snd_covox.c

@@ -285,6 +285,10 @@ static const device_config_t soundmasterplus_config[] = {
         .file_filter    = NULL,
         .spinner        = { 0 },
         .selection      = {
+            { .description = "0x220", .value = 0x220 },
+            { .description = "0x240", .value = 0x240 },
+            { .description = "0x280", .value = 0x280 },
+            { .description = "0x2c0", .value = 0x2c0 },
             { .description = "0x330", .value = 0x330 },
             { .description = "0x338", .value = 0x338 },
             { .description = ""                      }