diff --git a/src/include/86box/snd_ad1848.h b/src/include/86box/snd_ad1848.h
index 3105d75f9..6e8282485 100644
--- a/src/include/86box/snd_ad1848.h
+++ b/src/include/86box/snd_ad1848.h
@@ -70,7 +70,6 @@ typedef struct ad1848_t {
     uint64_t   timer_latch;
 
     pc_timer_t cs4231a_irq_timer;
-    uint8_t    is_opl3sa;
 
     int16_t buffer[SOUNDBUFLEN * 2];
     int     pos;
@@ -91,7 +90,6 @@ extern void ad1848_update(ad1848_t *ad1848);
 extern void ad1848_speed_changed(ad1848_t *ad1848);
 extern void ad1848_filter_cd_audio(int channel, double *buffer, void *priv);
 extern void ad1848_filter_aux2(void* priv, double* out_l, double* out_r);
-extern void ad1848_is_opl3sa(ad1848_t *ad1848);
 
 extern void ad1848_init(ad1848_t *ad1848, uint8_t type);
 
diff --git a/src/sound/snd_ad1848.c b/src/sound/snd_ad1848.c
index bad9f4d22..cd988a9ef 100644
--- a/src/sound/snd_ad1848.c
+++ b/src/sound/snd_ad1848.c
@@ -76,12 +76,6 @@ ad1848_setdma(ad1848_t *ad1848, int newdma)
     ad1848->dma = newdma;
 }
 
-void
-ad1848_is_opl3sa(ad1848_t *ad1848)
-{
-    ad1848->is_opl3sa = 1;
-}
-
 void
 ad1848_updatevolmask(ad1848_t *ad1848)
 {
@@ -524,8 +518,6 @@ readonly_x:
                 ad1848_updatefreq(ad1848);
 
             temp = (ad1848->type < AD1848_TYPE_CS4231) ? 2 : ((ad1848->type == AD1848_TYPE_CS4231) ? 18 : 4);
-            if (ad1848->is_opl3sa)
-                temp = 2; /* OPL3-SA CODEC is CS4231-based but uses Aux1 for CD audio */
             if (ad1848->regs[temp] & 0x80)
                 ad1848->cd_vol_l = 0;
             else
diff --git a/src/sound/snd_ymf701.c b/src/sound/snd_ymf701.c
index 1e45c786a..b18c48953 100644
--- a/src/sound/snd_ymf701.c
+++ b/src/sound/snd_ymf701.c
@@ -447,7 +447,6 @@ ymf701_init(const device_t *info)
 
     sound_add_handler(ymf701_get_buffer, ymf701);
     music_add_handler(sb_get_music_buffer_sbpro, ymf701->sb);
-    ad1848_is_opl3sa(&ymf701->ad1848);
     //sound_set_cd_audio_filter(sbpro_filter_cd_audio, ymf701->sb); /* CD audio filter for the default context */
     sound_set_cd_audio_filter(ad1848_filter_cd_audio, &ymf701->ad1848);