diff --git a/doc/TXTH.md b/doc/TXTH.md
index 77e83d78..98f4e8ff 100644
--- a/doc/TXTH.md
+++ b/doc/TXTH.md
@@ -140,6 +140,8 @@ as explained below, but often will use default values. Accepted codec strings:
 #   * Variation with modified encoding
 # - OKI16          OKI ADPCM with 16-bit output (not VOX/Dialogic 12-bit)
 #   * For rare PS2 games (Sweet Legacy, Hooligan)
+# - OKI4S          OKI ADPCM with 16-bit output and adjusted tables
+#   * For later Konami rhythm games
 # - AAC            Advanced Audio Coding (raw without .mp4)
 #   * For some 3DS games and many iOS games
 #   * Should set skip_samples (around 1024 but varies)
@@ -443,7 +445,7 @@ While you can put anything in the values, this feature is meant to be used to st
 You can set a default offset that affects next `@(offset)` reads making them `@(offset + base_offset)`, for cleaner parsing.
 
 This is particularly interesting when combined with offsets to some long value. For example instead of `channels = @0x714` you could set `base_offset = 0x710, channels = @0x04`. Or values from the `name_table`, like `base_offset = name_value, channels = @0x04`.
- 
+
 It also allows parsing formats that set offsets to another offset, by "chaining" `base_offset`. With `base_offset = @0x10` (pointing to `0x40`) then `base_offset = @0x20`, it reads value at `0x60`. Set to 0 when you want to disable/reset the chain: `base_offset = @0x10` then `base_offset = 0` then `base_offset = @0x20` reads value at `0x20`
 
 
diff --git a/src/coding/oki_decoder.c b/src/coding/oki_decoder.c
index 35280681..10b64a9e 100644
--- a/src/coding/oki_decoder.c
+++ b/src/coding/oki_decoder.c
@@ -197,7 +197,7 @@ void decode_oki4s(VGMSTREAMCHANNEL* stream, sample_t* outbuf, int channelspacing
                 stream->offset + i :    /* stereo: one nibble per channel */
                 stream->offset + i/2;   /* mono: consecutive nibbles (assumed) */
         int nibble_shift =
-                is_stereo ? (!(channel&1) ? 0:4) : (!(i&1) ? 0:4);  /* even = low, odd = high */
+                is_stereo ? (!(channel&1) ? 0:4) : ((i&1) ? 0:4);  /* even = low, odd = high */
 
         oki4s_expand_nibble(stream, byte_offset,nibble_shift, &hist1, &step_index, &out_sample);
         outbuf[sample_count] = (out_sample);
diff --git a/src/meta/txth.c b/src/meta/txth.c
index 958db9e4..230b1ad1 100644
--- a/src/meta/txth.c
+++ b/src/meta/txth.c
@@ -39,6 +39,7 @@ typedef enum {
     TGC = 29,           /* Tiger Game.com 4-bit ADPCM */
     ASF = 30,           /* Argonaut ASF 4-bit ADPCM */
     EAXA = 31,          /* Electronic Arts EA-XA 4-bit ADPCM v1 */
+    OKI4S = 32,         /* OKI ADPCM with 16-bit output (unlike OKI/VOX/Dialogic ADPCM's 12-bit) */
 } txth_type;
 
 typedef enum { DEFAULT, NEGATIVE, POSITIVE, INVERTED } txth_loop_t;
@@ -226,6 +227,7 @@ VGMSTREAM* init_vgmstream_txth(STREAMFILE* sf) {
         case PCM4:       coding = coding_PCM4; break;
         case PCM4_U:     coding = coding_PCM4_U; break;
         case OKI16:      coding = coding_OKI16; break;
+        case OKI4S:      coding = coding_OKI4S; break;
         case TGC:        coding = coding_TGC; break;
         case ASF:        coding = coding_ASF; break;
         case EAXA:       coding = coding_EA_XA; break;
@@ -337,6 +339,7 @@ VGMSTREAM* init_vgmstream_txth(STREAMFILE* sf) {
             break;
 
         case coding_OKI16:
+        case coding_OKI4S:
             vgmstream->layout_type = layout_none;
             break;
 
@@ -872,6 +875,7 @@ static int parse_keyval(STREAMFILE* sf_, txth_header* txth, const char * key, ch
         else if (is_string(val,"PCM4"))         txth->codec = PCM4;
         else if (is_string(val,"PCM4_U"))       txth->codec = PCM4_U;
         else if (is_string(val,"OKI16"))        txth->codec = OKI16;
+        else if (is_string(val,"OKI4S"))        txth->codec = OKI4S;
         else if (is_string(val,"AAC"))          txth->codec = AAC;
         else if (is_string(val,"TGC"))          txth->codec = TGC;
         else if (is_string(val,"GCOM_ADPCM"))   txth->codec = TGC;
@@ -1524,8 +1528,8 @@ static int parse_name_table(txth_header* txth, char * name_list) {
 
         //;VGM_LOG("TXTH: compare name '%s'\n", key);
         /* parse values if key (name) matches default ("") or filename with/without extension */
-        if (key[0]=='\0' 
-                || is_string_match(filename, key) 
+        if (key[0]=='\0'
+                || is_string_match(filename, key)
                 || is_string_match(basename, key)
                 || is_string_match(fullname, key)) {
             int n;
@@ -1790,6 +1794,7 @@ static int get_bytes_to_samples(txth_header* txth, uint32_t bytes) {
             return yamaha_bytes_to_samples(bytes, txth->channels);
         case PCFX:
         case OKI16:
+        case OKI4S:
             return oki_bytes_to_samples(bytes, txth->channels);
 
         /* untested */