+#ifdef GLK_MODULE_SOUND2
+/* Note that this section is nested inside the #ifdef GLK_MODULE_SOUND.
+ GLK_MODULE_SOUND must be defined if GLK_MODULE_SOUND2 is. */
+
+extern schanid_t glk_schannel_create_ext(glui32 rock, glui32 volume);
+extern glui32 glk_schannel_play_multi(schanid_t *chanarray, glui32 chancount,
+ glui32 *sndarray, glui32 soundcount, glui32 notify);
+extern void glk_schannel_pause(schanid_t chan);
+extern void glk_schannel_unpause(schanid_t chan);
+extern void glk_schannel_set_volume_ext(schanid_t chan, glui32 vol,
+ glui32 duration, glui32 notify);
+
+#endif /* GLK_MODULE_SOUND2 */