implemented virtual sequencer to complement the virtual synthesizer.

module/keyboard/keyboard.py

@@ -21,6 +21,7 @@
 while True:
     for msg in port.iter_pending():
         if hasattr(msg,"note"):
+            print(msg)
             if config.get('output','action')=="release" and msg.velocity>0:
                 pass
             elif config.get('output','action')=="press" and msg.velocity==0:
@@ -30,7 +31,7 @@
                 key = "{}.channel{:0>2d}.note".format(config.get('output','prefix'),msg.channel)
                 val = msg.note
                 r.set(key,val)
-                # send it as trigger: prefix.channel000.note=velocity
+                # send it as trigger: prefix.channel000.note=note
                 key = "{}.channel{:0>2d}.note".format(config.get('output','prefix'),msg.channel)
                 val = msg.velocity
                 r.publish(key,val)

module/launchcontrol/launchcontrol.py

@@ -11,7 +11,10 @@
 r = redis.StrictRedis(host=config.get('redis','hostname'), port=config.getint('redis','port'), db=0)
 
 # this is only for debugging
-mido.get_input_names()
+print('-------------------------')
+for port in mido.get_input_names():
+  print(port)
+print('-------------------------')
 
 port = mido.open_input(config.get('midi','device'))
 

module/sequencer/sequencer.ini

@@ -0,0 +1,32 @@
+[general]
+name="Sequencer"
+
+[redis]
+hostname=localhost
+port=6379
+
+[sequence]
+pattern000=  0   4   0   7
+pattern001=  0   4   7   9  10   9   7   4
+pattern002=  5  10  13  10
+pattern003=  5  13  12  10
+pattern004=  4   4   4   4
+pattern005=  5   5   5   5
+pattern006=  6   6   6   6
+pattern007=  7   7   7   7
+pattern008=  8   8   8   8
+pattern009=  9   9   9   9
+pattern010= 10  10  10  10
+
+[default]
+pattern=1         ; see above for the sequences
+rate=120          ; beats per minute
+offset=48
+
+[input]
+pattern=launchcontrol.channel00.control053
+rate=launchcontrol.channel00.control054
+offset=keyboard.channel00.note
+
+[output]
+prefix=sequencer

module/sequencer/sequencer.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+
+import math
+import ConfigParser # this is version 2.x specific,on version 3.x it is called "configparser" and has a different API
+import redis
+import time
+
+config = ConfigParser.ConfigParser()
+config.read('sequencer.ini')
+
+r = redis.StrictRedis(host=config.get('redis','hostname'),port=config.getint('redis','port'),db=0)
+
+pattern = r.get(config.get('input','pattern'))
+if pattern:
+    pattern = int(pattern)
+else:
+    pattern = config.getint('default','pattern')
+previous = pattern
+
+# get the corresponding pattern
+sequence = config.get('sequence',"pattern{:0>3d}".format(pattern))
+
+while True:
+
+    for note in sequence.split():
+        # this will return empty if not available
+        new = int(r.get(config.get('input','pattern')))
+        if pattern!=new:
+            pattern = new
+            try:
+              sequence = config.get('sequence',"pattern{:0>3d}".format(pattern))
+            except:
+              pass
+            # immediately start playing the new sequence
+            break
+
+        rate = r.get(config.get('input','rate'))
+        if rate:
+            rate = float(rate)
+        else:
+            rate = config.getfloat('default','rate')
+        # assume that value is between 0 and 127, map exponentially from 20 to 2000
+        # it should not get too low, otherwise the code with the sleep below becomes unresponsive
+        rate = 20*math.exp(rate*math.log(100)/127)
+
+        offset = r.get(config.get('input','offset'))
+        if offset:
+            offset = int(offset)
+        else:
+            offset = config.getint('default','offset')
+
+        note = int(note)
+
+        print(pattern, int(rate), offset, note)
+
+        key = "{}.note".format(config.get('output','prefix'))
+        val = note+offset
+        # send it as control value: prefix.channel000.note=note
+        r.set(key,val)
+        # send it as trigger: prefix.channel000.note=note
+        r.publish(key,val)
+
+        time.sleep(60/rate)

module/synthesizer/README.md

@@ -15,13 +15,9 @@ The LFO shapes the audio envelope. The LFO has two input controls for the freque
 
 The VCA shapes the audio envelope. The VCA has a single input controls for the attenuation.
 
-** NOT YET IMPLEMENTED: ADSR - attack, decay, sustain, release **
+** ADSR - attack, decay, sustain, release **
 
-The ADSR takes a trigger as input and generates a continuous envelope as output. It has four input controls.
-
-** NOT YET IMPLEMENTED: VCF - voltage controlled filter **
-
-The filter can be toggled between lowpass, highpass and bandpass filtering of the audio signal. It has two input controls for the frequency and bandwidth.
+The ADSR takes a trigger as input and generates a continuous envelope as output. It has input controls for A, D, S and R and for the trigger.
 
 ** Requirements **
 

module/synthesizer/synthesizer.ini

@@ -17,23 +17,25 @@ pitch=64
 lfo_frequency=64
 lfo_depth=64
 vca=64
-attack=16
-decay=16
-sustain=64
-release=32
+adsr_attack=16
+adsr_decay=16
+adsr_sustain=64
+adsr_release=32
 
 [input]
 sin=launchcontrol.channel00.control077
 tri=launchcontrol.channel00.control078
 saw=launchcontrol.channel00.control079
 sqr=launchcontrol.channel00.control080
-pitch=launchcontrol.channel00.control081
+; pitch=launchcontrol.channel00.control081
 ; pitch=keyboard.channel00.note
+pitch=sequencer.note
 lfo_frequency=launchcontrol.channel00.control082
 lfo_depth=launchcontrol.channel00.control083
 vca=launchcontrol.channel00.control084
-adsr_gate=launchcontrol.channel00.note
+; adsr_gate=launchcontrol.channel00.note
 ; adsr_gate=keyboard.channel00.note
+adsr_gate=sequencer.note
 adsr_attack=launchcontrol.channel00.control049
 adsr_decay=launchcontrol.channel00.control050
 adsr_sustain=launchcontrol.channel00.control051