Apply Sound Mixer volumes after every pccore_reset

src/c.zig

@@ -15,7 +15,12 @@ pub const c = @cImport({
 // need to mix cz.foo and c.bar).
 pub const pccore_init = c.pccore_init;
 pub const pccore_term = c.pccore_term;
-pub const pccore_reset = c.pccore_reset;
+// Wrapper (src/np2_glue.c) that runs the core reset and then re-applies the
+// Sound Mixer volumes — the core pccore_reset() resets the chips to their
+// power-on volume and never restores np2cfg.vol_*. Route all callers through
+// it so mixer settings survive every reset (incl. the initial one).
+pub extern fn usa_pccore_reset() void;
+pub const pccore_reset = usa_pccore_reset;
 pub extern fn usa_pccore_exec(draw: c_int) void;
 pub inline fn pccore_exec(draw: bool) void {
     usa_pccore_exec(if (draw) 1 else 0);

src/np2_glue.c

@@ -427,8 +427,9 @@ void usa_mouse_btn_up(int left) {
 }
 
 // Reset with HELP key held (for BIOS system setup menu)
+void usa_pccore_reset(void); // defined below; re-applies the Sound Mixer after reset
 void usa_reset_with_help(void) {
-	pccore_reset();
+	usa_pccore_reset();
 	keystat_keydown(0x3f);
 }
 
@@ -674,6 +675,18 @@ void usa_sound_apply_volumes(void) {
     fmboard_updatevolume();
 }
 
+// pccore_reset() resets every sound chip back to its power-on volume,
+// dropping the FMGEN linear volumes / cs4231 scaling that the basic
+// sound_init() path never establishes — so the Sound Mixer settings end up
+// ignored after a reset (including the initial reset at startup). Wrap the
+// core reset and re-apply the full np2cfg.vol_* mixer afterwards, matching
+// the live slider-edit path. Done here in the glue layer so NP2kai's core
+// stays unpatched. All reset call sites route through this wrapper.
+void usa_pccore_reset(void) {
+    pccore_reset();
+    fmboard_updatevolume();
+}
+
 void usa_pal_makelcdpal(void) { pal_makelcdpal(); }
 void usa_pal_makeskiptable(void) { pal_makeskiptable(); }
 void usa_gdc_restorekacmode(void) { gdc_restorekacmode(); }