From ceeb2d057dcaf49c24edfe4fbf6bd87424a11dc0 Mon Sep 17 00:00:00 2001
From: win2kgamer <47463859+win2kgamer@users.noreply.github.com>
Date: Tue, 21 Oct 2025 20:32:13 -0500
Subject: [PATCH] AD1848: I18/I19 directly control FM volume on CS4232/4236
 non-B

---
 src/sound/snd_ad1848.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/sound/snd_ad1848.c b/src/sound/snd_ad1848.c
index 62c3e35e9..ebfa9423b 100644
--- a/src/sound/snd_ad1848.c
+++ b/src/sound/snd_ad1848.c
@@ -425,6 +425,19 @@ ad1848_write(uint16_t addr, uint8_t val, void *priv)
                                 ad1848->fm_vol_r = (int) ad1848_vols_5bits_aux_gain[val & 0x1f];
                         }
                     }
+                    if ((ad1848->type >= AD1848_TYPE_CS4232) && (ad1848->type <= AD1848_TYPE_CS4236)) {
+                        if (ad1848->index == 18) {
+                            if (val & 0x80)
+                                ad1848->fm_vol_l = 0;
+                            else
+                                ad1848->fm_vol_l = (int) ad1848_vols_5bits_aux_gain[val & 0x1f];
+                        } else {
+                            if (val & 0x80)
+                                ad1848->fm_vol_r = 0;
+                            else
+                                ad1848->fm_vol_r = (int) ad1848_vols_5bits_aux_gain[val & 0x1f];
+                        }
+                    }
                     break;
 
                 case 20 ... 21: