Gen 1: Trigger support based on "Matrix" element presence

src/window-iface.c

@@ -51,6 +51,10 @@ void create_card_window(struct alsa_card *card) {
     has_startup = false;
     has_mixer = false;
 
+  // Scarlett Gen 1
+  } else if (get_elem_by_prefix(card->elems, "Matrix")) {
+    card->window_main_contents = create_iface_mixer_main(card);
+
   // Scarlett Gen 2, Gen 3 4i4+, Gen 4, Clarett, or Vocaster
   } else if (get_elem_by_prefix(card->elems, "Mixer")) {
     card->window_main_contents = create_iface_mixer_main(card);