Add support for 4-pin range sensors, the velocity sensor, and LED status.

FossilOrigin-Name: ab34614152b3a25488aa4b55c45ec4a6f625bde42cd794209464825bb7654040

theremin/lib/fluidsynth.rb

@@ -48,11 +48,13 @@ class FluidSynth
 	end
 
 
+	### Instance a new fluidsynth interface.
+	###
 	def initialize( host=DEFAULT_HOST, port=DEFAULT_PORT )
 		@host = host
 		@port = port
 		@lastnote = nil
-		@velocity = 80
+		@velocity = 0
 	end
 
 	# The TCP socket to fluidsynth.
@@ -96,6 +98,14 @@ class FluidSynth
 	end
 
 
+	### Select a loaded soundfont and instrument by index.
+	### (Always using channel 0.)
+	###
+	def instrument( font_idx, instrument_idx )
+		self.send "select 0 #{font_idx} 0 #{instrument_idx}"
+	end
+
+
 	### Turn glide (portamento) on or off.  Val is an integer that
 	### represents 128ms.  4 == 512ms.
 	###
@@ -132,13 +142,6 @@ class FluidSynth
 	end
 
 
-	### Selects an instrument +index+ within the currently loaded sf2 for channel 0.
-	###
-	def instrument( index )
-		self.send "select 0 1 0 #{index}"
-	end
-
-
 	### Loads a resource (sf2, etc) from +path+.
 	###
 	def load( path )