1 files changed, 6 insertions, 1 deletions
diff --git a/include/xas/synth.h b/include/xas/synth.h
index 61f50bc..c13c53e 100644
--- a/include/xas/synth.h
+++ b/include/xas/synth.h
@@ -7,6 +7,7 @@
 #include <xas/object.h>
 #include <xas/audio.h>
 
+#define XAS_SYNTH_DEFAULT_GAIN      1.0f
 #define XAS_SYNTH_DEFAULT_FREQUENCY 2600 /* Hz */
 
 enum xas_synth_type {
@@ -36,7 +37,9 @@ struct _xas_synth {
 
     xas_synth_sample_callback sample;
 
-    float phase;
+    float phase,
+          gain;
+
     size_t frequency;
 };
 
@@ -46,6 +49,8 @@ xas_synth *xas_synth_new(xas_audio_format format,
 
 void xas_synth_destroy(xas_synth *synth);
 
+void xas_synth_set_gain(xas_synth *synth, float gain);
+
 void xas_synth_set_frequency(xas_synth *synth, size_t frequency);
 
 void xas_synth_start(xas_synth *synth);