diff --git a/app/src/main/cpp/sox/CmakeLists.txt b/app/src/main/cpp/sox/CmakeLists.txt
index 1f6aee6..80ed941 100644
--- a/app/src/main/cpp/sox/CmakeLists.txt
+++ b/app/src/main/cpp/sox/CmakeLists.txt
@@ -112,7 +112,6 @@ set(formats_srcs
         sounder.c
         soundtool.c
         sox-fmt.c
-        sphere.c
         tx16w.c
         u1-fmt.c
         u2-fmt.c
diff --git a/app/src/main/cpp/sox/formats.h b/app/src/main/cpp/sox/formats.h
index a1ec042..e380743 100644
--- a/app/src/main/cpp/sox/formats.h
+++ b/app/src/main/cpp/sox/formats.h
@@ -49,7 +49,7 @@
   FORMAT(sounder)
   FORMAT(soundtool)
   FORMAT(sox)
-  FORMAT(sphere)
+//  FORMAT(sphere)
 //  FORMAT(svx)
   FORMAT(txw)
   FORMAT(u1)
diff --git a/app/src/main/cpp/sox/sphere.c b/app/src/main/cpp/sox/sphere.c
deleted file mode 100644
index a3fd1c6..0000000
--- a/app/src/main/cpp/sox/sphere.c
+++ /dev/null
@@ -1,199 +0,0 @@
-/* libSoX NIST Sphere file format handler.
- *
- * August 7, 2000
- *
- * Copyright (C) 2000 Chris Bagwell (cbagwell@sprynet.com)
- *
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published by
- * the Free Software Foundation; either version 2.1 of the License, or (at
- * your option) any later version.
- *
- * This library is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
- * General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
- */
-
-#include "sox_i.h"
-#include <string.h>
-
-static int start_read(sox_format_t * ft)
-{
-  unsigned long header_size_ul = 0, num_samples_ul = 0;
-  sox_encoding_t encoding = SOX_ENCODING_SIGN2;
-  size_t     header_size, bytes_read;
-  size_t     num_samples = 0;
-  unsigned       bytes_per_sample = 0;
-  unsigned       channels = 1;
-  unsigned       rate = 16000;
-  char           fldname[64], fldtype[16], fldsval[128];
-  char           * buf;
-
-  /* Magic header */
-  if (lsx_reads(ft, fldname, (size_t)8) || strncmp(fldname, "NIST_1A", (size_t)7) != 0) {
-    lsx_fail_errno(ft, SOX_EHDR, "Sphere header does not begin with magic word `NIST_1A'");
-    return (SOX_EOF);
-  }
-
-  if (lsx_reads(ft, fldsval, (size_t)8)) {
-    lsx_fail_errno(ft, SOX_EHDR, "Error reading Sphere header");
-    return (SOX_EOF);
-  }
-
-  /* Determine header size, and allocate a buffer large enough to hold it. */
-  sscanf(fldsval, "%lu", &header_size_ul);
-  if (header_size_ul < 16) {
-    lsx_fail_errno(ft, SOX_EHDR, "Error reading Sphere header");
-    return (SOX_EOF);
-  }
-
-  buf = lsx_malloc(header_size = header_size_ul);
-
-  /* Skip what we have read so far */
-  header_size -= 16;
-
-  if (lsx_reads(ft, buf, header_size) == SOX_EOF) {
-    lsx_fail_errno(ft, SOX_EHDR, "Error reading Sphere header");
-    free(buf);
-    return (SOX_EOF);
-  }
-
-  header_size -= (strlen(buf) + 1);
-
-  while (strncmp(buf, "end_head", (size_t)8) != 0) {
-    if (strncmp(buf, "sample_n_bytes", (size_t)14) == 0)
-      sscanf(buf, "%63s %15s %u", fldname, fldtype, &bytes_per_sample);
-    else if (strncmp(buf, "channel_count", (size_t)13) == 0)
-      sscanf(buf, "%63s %15s %u", fldname, fldtype, &channels);
-    else if (strncmp(buf, "sample_count ", (size_t)13) == 0)
-      sscanf(buf, "%53s %15s %lu", fldname, fldtype, &num_samples_ul);
-    else if (strncmp(buf, "sample_rate ", (size_t)12) == 0)
-      sscanf(buf, "%53s %15s %u", fldname, fldtype, &rate);
-    else if (strncmp(buf, "sample_coding", (size_t)13) == 0) {
-      sscanf(buf, "%63s %15s %127s", fldname, fldtype, fldsval);
-      if (!strcasecmp(fldsval, "ulaw") || !strcasecmp(fldsval, "mu-law"))
-        encoding = SOX_ENCODING_ULAW;
-      else if (!strcasecmp(fldsval, "pcm"))
-        encoding = SOX_ENCODING_SIGN2;
-      else {
-        lsx_fail_errno(ft, SOX_EFMT, "sph: unsupported coding `%s'", fldsval);
-        free(buf);
-        return SOX_EOF;
-      }
-    }
-    else if (strncmp(buf, "sample_byte_format", (size_t)18) == 0) {
-      sscanf(buf, "%53s %15s %127s", fldname, fldtype, fldsval);
-      if (strcmp(fldsval, "01") == 0)         /* Data is little endian. */
-        ft->encoding.reverse_bytes = MACHINE_IS_BIGENDIAN;
-      else if (strcmp(fldsval, "10") == 0)    /* Data is big endian. */
-        ft->encoding.reverse_bytes = MACHINE_IS_LITTLEENDIAN;
-      else if (strcmp(fldsval, "1")) {
-        lsx_fail_errno(ft, SOX_EFMT, "sph: unsupported coding `%s'", fldsval);
-        free(buf);
-        return SOX_EOF;
-      }
-    }
-
-    if (lsx_reads(ft, buf, header_size) == SOX_EOF) {
-      lsx_fail_errno(ft, SOX_EHDR, "Error reading Sphere header");
-      free(buf);
-      return (SOX_EOF);
-    }
-
-    header_size -= (strlen(buf) + 1);
-  }
-
-  if (!bytes_per_sample)
-    bytes_per_sample = encoding == SOX_ENCODING_ULAW? 1 : 2;
-
-  while (header_size) {
-    bytes_read = lsx_readbuf(ft, buf, header_size);
-    if (bytes_read == 0) {
-      free(buf);
-      return (SOX_EOF);
-    }
-    header_size -= bytes_read;
-  }
-  free(buf);
-
-  if (ft->seekable) {
-    /* Check first four bytes of data to see if it's shorten compressed. */
-    char           shorten_check[4];
-
-    if (lsx_readchars(ft, shorten_check, sizeof(shorten_check)))
-      return SOX_EOF;
-    lsx_seeki(ft, -(off_t)sizeof(shorten_check), SEEK_CUR);
-
-    if (!memcmp(shorten_check, "ajkg", sizeof(shorten_check))) {
-      lsx_fail_errno(ft, SOX_EFMT,
-                     "File uses shorten compression, cannot handle this.");
-      return (SOX_EOF);
-    }
-  }
-
-  num_samples = num_samples_ul;
-  return lsx_check_read_params(ft, channels, (sox_rate_t)rate, encoding,
-      bytes_per_sample << 3, (uint64_t)num_samples * channels, sox_true);
-}
-
-static int write_header(sox_format_t * ft)
-{
-  char buf[128];
-  uint64_t samples = (ft->olength ? ft->olength : ft->signal.length) / ft->signal.channels;
-
-  lsx_writes(ft, "NIST_1A\n");
-  lsx_writes(ft, "   1024\n");
-
-  if (samples) {
-    sprintf(buf, "sample_count -i %" PRIu64 "\n", samples);
-    lsx_writes(ft, buf);
-  }
-
-  sprintf(buf, "sample_n_bytes -i %d\n", ft->encoding.bits_per_sample >> 3);
-  lsx_writes(ft, buf);
-
-  sprintf(buf, "channel_count -i %d\n", ft->signal.channels);
-  lsx_writes(ft, buf);
-
-  if (ft->encoding.bits_per_sample == 8)
-    sprintf(buf, "sample_byte_format -s1 1\n");
-  else
-    sprintf(buf, "sample_byte_format -s2 %s\n",
-            ft->encoding.reverse_bytes != MACHINE_IS_BIGENDIAN ? "10" : "01");
-  lsx_writes(ft, buf);
-
-  sprintf(buf, "sample_rate -i %u\n", (unsigned) (ft->signal.rate + .5));
-  lsx_writes(ft, buf);
-
-  if (ft->encoding.encoding == SOX_ENCODING_ULAW)
-    lsx_writes(ft, "sample_coding -s4 ulaw\n");
-  else
-    lsx_writes(ft, "sample_coding -s3 pcm\n");
-
-  lsx_writes(ft, "end_head\n");
-
-  lsx_padbytes(ft, 1024 - (size_t)lsx_tell(ft));
-  return SOX_SUCCESS;
-}
-
-LSX_FORMAT_HANDLER(sphere)
-{
-  static char const *const names[] = {"sph", "nist", NULL};
-  static unsigned const write_encodings[] = {
-    SOX_ENCODING_SIGN2, 8, 16, 24, 32, 0,
-    SOX_ENCODING_ULAW, 8, 0,
-    0
-  };
-  static sox_format_handler_t const handler = {SOX_LIB_VERSION_CODE,
-    "SPeech HEader Resources; defined by NIST", names, SOX_FILE_REWIND,
-    start_read, lsx_rawread, NULL,
-    write_header, lsx_rawwrite, NULL,
-    lsx_rawseek, write_encodings, NULL, 0
-  };
-  return &handler;
-}