diff --git a/src/sound/snd_ad1848.c b/src/sound/snd_ad1848.c
index 44e328842..181d2158e 100644
--- a/src/sound/snd_ad1848.c
+++ b/src/sound/snd_ad1848.c
@@ -411,19 +411,6 @@ ad1848_write(uint16_t addr, uint8_t val, void *priv)
                                 goto readonly_i;
                         }
 
-                        /* HACK: the Windows 9x driver's "Synth" control writes to this
-                           register with no remapping, even if internal FM is enabled. */
-                        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];
-                        }
                     }
                     if ((ad1848->type >= AD1848_TYPE_CS4232) && (ad1848->type <= AD1848_TYPE_CS4236)) {
                         if (ad1848->index == 18) {
diff --git a/src/sound/snd_cs423x.c b/src/sound/snd_cs423x.c
index b9004454e..264171b1e 100644
--- a/src/sound/snd_cs423x.c
+++ b/src/sound/snd_cs423x.c
@@ -290,7 +290,7 @@ cs423x_write(uint16_t addr, uint8_t val, void *priv)
                         ad1848_init(&dev->ad1848, dev->ad1848_type);
                         ad1848_set_cd_audio_channel(&dev->ad1848, AD1848_AUX2);
                     }
-                    val = 0x00;
+                    val &= 0x07;
                     break;
 
                 case 1:         /* Version / Chip ID */