Hey Fernando,
oh yeah, my slsh folder was still there. I did another test with the serial monitor, the existing swng file name convention did follow your recommendations above e.g. swng##.wav.
15:00:06.508 -> Welcome to ProffieOS, type 'help' for more info.
15:00:11.029 -> EVENT: Swing millis=172913
15:00:11.029 -> Ignition.
15:00:11.062 -> unit = 0 vol = 0.00, Playing Bal Venos/hum/hum01.wav
15:00:11.062 -> channels: 1 rate: 44100 bits: 16
15:00:11.062 -> unit = 1 vol = 0.50, Playing Bal Venos/out/out04.wav
15:00:11.062 -> channels: 1 rate: 44100 bits: 16
15:00:11.062 -> humstart: 1800
15:00:11.062 -> unit = 2 vol = 0.50, Playing Bal Venos/swingl/swingl01.wav
15:00:11.062 -> channels: 1 rate: 44100 bits: 16
15:00:11.062 -> unit = 3 vol = 0.50, Playing Bal Venos/swingh/swingh01.wav
15:00:11.096 -> channels: 1 rate: 44100 bits: 16
15:00:11.096 -> Entering Battle Mode
15:00:12.124 -> Playing Bal Venos/swingh/swingh01.wav
15:00:12.124 -> channels: 1 rate: 44100 bits: 16
15:00:12.190 -> unit = 2 vol = 0.00, Playing Bal Venos/swingl/swingl03.wav
15:00:12.190 -> channels: 1 rate: 44100 bits: 16
15:00:12.190 -> unit = 3 vol = 0.00, Playing Bal Venos/swingh/swingh03.wav
15:00:12.190 -> channels: 1 rate: 44100 bits: 16
15:00:13.583 -> EVENT: Swing ON millis=175471
15:00:13.682 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng6.wav
15:00:13.682 -> channels: 1 rate: 44100 bits: 16
15:00:13.948 -> EVENT: Swing ON millis=175819
15:00:13.981 -> unit = 4 vol = 0.50, Playing Bal Venos/swng/swng8.wav
15:00:13.981 -> channels: 1 rate: 44100 bits: 16
15:00:14.114 -> Playing Bal Venos/swingl/swingl03.wav
15:00:14.114 -> channels: 1 rate: 44100 bits: 16
15:00:14.346 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng11.wav
15:00:14.346 -> channels: 1 rate: 44100 bits: 16
15:00:14.512 -> EVENT: Clash ON millis=176413
15:00:14.512 -> unit = 4 vol = 0.50, Playing Bal Venos/clsh/clsh05.wav
15:00:14.545 -> channels: 1 rate: 44100 bits: 16
15:00:14.612 -> unit = 2 vol = 0.00, Playing Bal Venos/swingl/swingl07.wav
15:00:14.645 -> channels: 1 rate: 44100 bits: 16
15:00:14.645 -> unit = 3 vol = 0.20, Playing Bal Venos/swingh/swingh07.wav
15:00:14.645 -> channels: 1 rate: 44100 bits: 16
15:00:14.678 -> EVENT: Swing ON millis=176556
15:00:15.010 -> EVENT: Swing ON millis=176891
15:00:15.076 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng1.wav
15:00:15.076 -> channels: 1 rate: 44100 bits: 16
15:00:15.374 -> EVENT: Swing ON millis=177248
15:00:15.441 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng4.wav
15:00:15.474 -> channels: 1 rate: 44100 bits: 16
15:00:15.773 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng9.wav
15:00:15.773 -> channels: 1 rate: 44100 bits: 16
15:00:16.171 -> unit = 3 vol = 0.00, Playing Bal Venos/swingl/swingl06.wav
15:00:16.171 -> channels: 1 rate: 44100 bits: 16
15:00:16.171 -> unit = 2 vol = 0.00, Playing Bal Venos/swingh/swingh06.wav
15:00:16.171 -> channels: 1 rate: 44100 bits: 16
15:00:16.835 -> EVENT: Swing ON millis=178726
15:00:16.868 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng11.wav
15:00:16.901 -> channels: 1 rate: 44100 bits: 16
15:00:17.266 -> EVENT: Swing ON millis=179143
15:00:17.499 -> EVENT: Swing ON millis=179372
15:00:17.566 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng1.wav
15:00:17.566 -> channels: 1 rate: 44100 bits: 16
15:00:17.599 -> EVENT: Clash ON millis=179492
15:00:17.599 -> unit = 4 vol = 0.50, Playing Bal Venos/clsh/clsh06.wav
15:00:17.632 -> channels: 1 rate: 44100 bits: 16
15:00:17.731 -> unit = 5 vol = 0.50, Playing Bal Venos/swng/swng18.wav
15:00:17.731 -> channels: 1 rate: 44100 bits: 16
15:00:17.897 -> unit = 3 vol = 0.41, Playing Bal Venos/swingl/swingl04.wav
15:00:17.931 -> channels: 1 rate: 44100 bits: 16
15:00:17.931 -> unit = 2 vol = 0.12, Playing Bal Venos/swingh/swingh04.wav
15:00:17.931 -> channels: 1 rate: 44100 bits: 16
15:00:17.931 -> EVENT: Clash ON millis=179824
15:00:17.931 -> unit = 1 vol = 0.50, Playing Bal Venos/clsh/clsh13.wav
15:00:17.964 -> channels: 1 rate: 44100 bits: 16
15:00:18.064 -> unit = 4 vol = 0.50, Playing Bal Venos/swng/swng18.wav
15:00:18.097 -> channels: 1 rate: 44100 bits: 16
15:00:18.097 -> EVENT: Swing ON millis=179974
15:00:18.163 -> Battery voltage: 0.21
15:00:18.263 -> unit = 5 vol = 0.50, Playing Bal Venos/swng/swng18.wav
15:00:18.296 -> channels: 1 rate: 44100 bits: 16
15:00:18.462 -> EVENT: Swing ON millis=180339
15:00:18.628 -> EVENT: Swing ON millis=180508
15:00:18.695 -> EVENT: Clash ON millis=180575
15:00:18.695 -> unit = 1 vol = 0.50, Playing Bal Venos/clsh/clsh10.wav
15:00:18.695 -> channels: 1 rate: 44100 bits: 16
15:00:18.860 -> EVENT: Swing ON millis=180745
15:00:19.822 -> EVENT: Swing ON millis=181722
15:00:20.187 -> unit = 3 vol = 0.00, Playing Bal Venos/swingl/swingl06.wav
15:00:20.187 -> channels: 1 rate: 44100 bits: 16
15:00:20.187 -> unit = 2 vol = 0.00, Playing Bal Venos/swingh/swingh06.wav
15:00:20.187 -> channels: 1 rate: 44100 bits: 16
15:00:20.220 -> EVENT: Swing ON millis=182095
15:00:20.220 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng18.wav
15:00:20.220 -> channels: 1 rate: 44100 bits: 16
15:00:20.386 -> EVENT: Swing ON millis=182261
15:00:20.485 -> unit = 4 vol = 0.50, Playing Bal Venos/swng/swng18.wav
15:00:20.485 -> channels: 1 rate: 44100 bits: 16
15:00:20.651 -> EVENT: Swing ON millis=182548
15:00:20.718 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng18.wav
15:00:20.718 -> channels: 1 rate: 44100 bits: 16
15:00:20.817 -> unit = 5 vol = 0.50, Playing Bal Venos/swng/swng11.wav
15:00:20.851 -> channels: 1 rate: 44100 bits: 16
15:00:21.083 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng6.wav
15:00:21.083 -> channels: 1 rate: 44100 bits: 16
15:00:21.216 -> EVENT: Swing ON millis=183090
15:00:21.216 -> unit = 4 vol = 0.50, Playing Bal Venos/swng/swng11.wav
15:00:21.249 -> channels: 1 rate: 44100 bits: 16
15:00:21.481 -> EVENT: Swing ON millis=183350
15:00:21.514 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng13.wav
15:00:21.514 -> channels: 1 rate: 44100 bits: 16
15:00:22.111 -> unit = 2 vol = 0.00, Playing Bal Venos/swingl/swingl08.wav
15:00:22.111 -> channels: 1 rate: 44100 bits: 16
15:00:22.145 -> unit = 3 vol = 0.00, Playing Bal Venos/swingh/swingh08.wav
15:00:22.145 -> channels: 1 rate: 44100 bits: 16
15:00:23.073 -> EVENT: Swing ON millis=184974
15:00:23.903 -> unit = 2 vol = 0.00, Playing Bal Venos/swingl/swingl01.wav
15:00:23.903 -> channels: 1 rate: 44100 bits: 16
15:00:23.936 -> unit = 3 vol = 0.00, Playing Bal Venos/swingh/swingh01.wav
15:00:23.936 -> channels: 1 rate: 44100 bits: 16
15:00:24.036 -> EVENT: Swing ON millis=185920
15:00:24.666 -> EVENT: Swing ON millis=186542
15:00:24.932 -> unit = 3 vol = 0.00, Playing Bal Venos/swingl/swingl02.wav
15:00:24.932 -> channels: 1 rate: 44100 bits: 16
15:00:24.932 -> unit = 2 vol = 0.00, Playing Bal Venos/swingh/swingh02.wav
15:00:24.932 -> channels: 1 rate: 44100 bits: 16
15:00:24.998 -> EVENT: Swing ON millis=186890
15:00:25.529 -> EVENT: Swing ON millis=187404
15:00:25.861 -> EVENT: Swing ON millis=187737
15:00:26.259 -> EVENT: Swing ON millis=188153
15:00:26.524 -> EVENT: Swing ON millis=188412
15:00:26.558 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng15.wav
15:00:26.558 -> channels: 1 rate: 44100 bits: 16
15:00:26.823 -> EVENT: Swing ON millis=188725
15:00:27.022 -> EVENT: Swing ON millis=188911
15:00:27.254 -> EVENT: Swing ON millis=189132
15:00:27.387 -> EVENT: Swing ON millis=189280
15:00:27.420 -> unit = 1 vol = 0.50, Playing Bal Venos/swng/swng7.wav
15:00:27.420 -> channels: 1 rate: 44100 bits: 16
15:00:27.619 -> EVENT: Swing ON millis=189492
15:00:27.785 -> EVENT: Swing ON millis=189661
15:00:27.918 -> EVENT: Swing ON millis=189796
15:00:28.084 -> EVENT: Swing ON millis=189978
15:00:28.448 -> EVENT: Swing ON millis=190345
15:00:28.548 -> EVENT: Swing ON millis=190446
15:00:28.747 -> EVENT: Swing ON millis=190634
15:00:28.880 -> unit = 2 vol = 0.00, Playing Bal Venos/swingl/swingl07.wav
15:00:28.880 -> channels: 1 rate: 44100 bits: 16
15:00:28.880 -> unit = 3 vol = 0.00, Playing Bal Venos/swingh/swingh07.wav
15:00:28.880 -> channels: 1 rate: 44100 bits: 16
15:00:30.073 -> unit = 2 vol = 0.00, Playing Bal Venos/swingl/swingl04.wav
15:00:30.073 -> channels: 1 rate: 44100 bits: 16
15:00:30.073 -> unit = 3 vol = 0.00, Playing Bal Venos/swingh/swingh04.wav
15:00:30.073 -> channels: 1 rate: 44100 bits: 16
15:00:32.328 -> unit = 3 vol = 0.00, Playing Bal Venos/swingl/swingl08.wav
15:00:32.328 -> channels: 1 rate: 44100 bits: 16
15:00:32.361 -> unit = 2 vol = 0.00, Playing Bal Venos/swingh/swingh08.wav
15:00:32.361 -> channels: 1 rate: 44100 bits: 16
15:00:32.859 -> EVENT: Swing ON millis=194735
15:00:32.926 -> EVENT: Clash ON millis=194833
15:00:32.926 -> unit = 1 vol = 0.50, Playing Bal Venos/clsh/clsh11.wav
15:00:32.959 -> channels: 1 rate: 44100 bits: 16
15:00:33.456 -> EVENT: Clash ON millis=195338
15:00:33.456 -> unit = 1 vol = 0.50, Playing Bal Venos/bgnlock/bgnlock1.wav
15:00:33.456 -> channels: 1 rate: 44100 bits: 16
15:00:33.655 -> unit = 4 vol = 0.50, Playing Bal Venos/endlock/endlock2.wav
15:00:33.655 -> channels: 1 rate: 44100 bits: 16
15:00:33.821 -> EVENT: Swing ON millis=195720
15:00:34.318 -> EVENT: Swing ON millis=196210
15:00:34.385 -> EVENT: Clash ON millis=196295
15:00:34.385 -> unit = 1 vol = 0.50, Playing Bal Venos/clsh/clsh09.wav
15:00:34.418 -> channels: 1 rate: 44100 bits: 16
15:00:34.816 -> EVENT: Swing ON millis=196690
15:00:34.849 -> EVENT: Clash ON millis=196760
15:00:34.849 -> unit = 5 vol = 0.50, Playing Bal Venos/clsh/clsh02.wav
15:00:34.882 -> channels: 1 rate: 44100 bits: 16
15:00:35.778 -> unit = 2 vol = 0.00, Playing Bal Venos/swingl/swingl05.wav
15:00:35.778 -> channels: 1 rate: 44100 bits: 16
15:00:35.778 -> unit = 3 vol = 0.00, Playing Bal Venos/swingh/swingh05.wav
15:00:35.778 -> channels: 1 rate: 44100 bits: 16
15:00:36.109 -> Playing Bal Venos/swingl/swingl05.wav
15:00:36.109 -> channels: 1 rate: 44100 bits: 16
15:00:36.806 -> unit = 2 vol = 0.00, Playing Bal Venos/swingl/swingl05.wav
15:00:36.806 -> channels: 1 rate: 44100 bits: 16
15:00:36.839 -> unit = 3 vol = 0.00, Playing Bal Venos/swingh/swingh05.wav
15:00:36.839 -> channels: 1 rate: 44100 bits: 16
15:00:38.104 -> unit = 3 vol = 0.00, Playing Bal Venos/swingl/swingl03.wav
15:00:38.104 -> channels: 1 rate: 44100 bits: 16
15:00:38.104 -> unit = 2 vol = 0.00, Playing Bal Venos/swingh/swingh03.wav
15:00:38.104 -> channels: 1 rate: 44100 bits: 16
15:00:38.170 -> Battery voltage: 0.15
15:00:42.118 -> Playing Bal Venos/swingh/swingh03.wav
15:00:42.118 -> channels: 1 rate: 44100 bits: 16
15:00:43.909 -> unit = 1 vol = 0.50, Playing Bal Venos/in/in04.wav
15:00:43.909 -> channels: 1 rate: 44100 bits: 16
15:00:44.506 -> Playing Bal Venos/pstoff.wav
15:00:44.506 -> channels: 1 rate: 44100 bits: 16
15:00:46.927 -> Amplifier off.
15:00:47.922 -> Unmounting SD Card.
looks like the swings are working based on the order I have them and I did a few hard swings and soft swings as well.
I’m aslo mindful of the testing method cause I don’t have a long usb cable. but I think this is working as expected.