diff --git a/scenes/main.gd b/scenes/main.gd
index 877901d..4b345be 100644
--- a/scenes/main.gd
+++ b/scenes/main.gd
@@ -75,8 +75,6 @@ func _make_tone(freq_hz: float, length: float, sample_rate: int,  amplitude: int
 
 func _on_wav_button_pressed() -> void:
 	var data: Array[int] = []
-	var loc_phase := 0.0
-	var increment = pulse_hz / sample_hz
 	var _use_test_data := false
 	var amp := 100
 	
@@ -106,8 +104,23 @@ func _on_wav_button_pressed() -> void:
 	wav.data = data
 	
 	print("Writing WAV with ", data.size(), " length")
-	wav.save_to_wav("/tmp/foo.wav")
-	
+	var proposed_fname := "morse-" + Time.get_datetime_string_from_system(true) +  ".wav"
+	match OS.get_name():
+		["Linux", "macOS", "Windows"]:
+			wav.save_to_wav("/tmp/foo.wav")
+		"Android":
+			print("Whaaat")
+		"Web":
+			print("download")
+			# we either write our own wave header method or we use a temporary file
+			# FIXME: find out if we have our own temp / if our filename needs to be random
+			var tmp_file := "/tmp/morse.wav"
+			wav.save_to_wav(tmp_file)
+			# var wav_file := FileAccess.open(tmp_file, FileAccess.READ)
+			var wav_data := FileAccess.get_file_as_bytes(tmp_file)
+			JavaScriptBridge.download_buffer(wav_data, proposed_fname, "audio/vnd.wave")
+		var platform:
+			print("Saving not supported on platform " + platform)
 
 func _on_reset_button_pressed() -> void:
 	MorseState.reset()