Getting a few things together, in Sonic Pi. Pulse width and ring modulation driven by breath. Lip pressure (sent through MIDI as pitch bend) modulates the ring modulation mix. Incoming notes for the melody (with TB-303 type synth), counter motion for the counter melody (in FM synth).

counter_ringy_bendy.rb

use_real_time # Preventing latency
use_tuning :just, :c # Just Intonation
delta=counter=naute=idx=0 # Initialize a few things
previous=60 # First note for the counter melody
gamme=(scale 50, :hex_dorian, num_octaves: 5) # Setting a “ring” of values in which to find incoming notes
counter_gamme=(scale 38, :hex_dorian, num_octaves: 2) # Same for the countermelody, an octave below
with_fx :compressor, threshold: 0.2 do # Preventing clipping
  with_fx :reverb, room: 0.8 do # Everything on the same reverb
    with_fx :ring_mod, mix_slide: 0.02 do |ringy| # Everything on lip-controlled Ring Mod
      with_fx :rlpf, res: 0.7, cutoff_slide: 0.02 do |lipf| # Everything on breath-controlled low-pass filter
        tibi = synth :tb303, note: 0, wave: 1, pulse_width_slide: 0.02, res: 0.7, release: 1000, amp: 0 # TB-303-inspired pulse
        counter_melody = synth :fm, divider: 4, note: 0, release: 1000, amp: 0 # FM synthesis
        live_loop :notes do
          note_on, velocity = sync "/midi/USB_Midi_Cable/4/1/note_on" # Incoming notes from Yamaha WX-11 wind controller
          if velocity > 0 # Only use actual note-ons
            delta=note_on - previous # Are we going up or down? By how much?
            if gamme.index(note_on) # If you find the note in the scale…
              idx=gamme.index(note_on) # Set the position in the scale
              control tibi, note_slide: 0 # No portamento
            else
              control tibi, note_slide: 0.25 # Otherwise, add portamento
              if delta > 0 # We’re going up, so go up the scale
                idx=idx+1
              else
                idx=idx-1 # Otherwise, go down the scale
              end
            end
            naute=gamme[idx] # Find the note in the scale
            control tibi, note: naute, amp: velocity / 150.0 # Incoming note
            if delta < 0 # If we’re going down
              counter=counter_gamme.tick # Increment the counter if we’re going down
            else
              counter=counter_gamme.reverse.tick # Decrement it otherwise
            end
            control counter_melody, note: counter-12, amp: velocity / 160.0 # The counter note goes in reverse motion, an octave lower
            previous=naute # Set the current note for the next time around
            control ringy, freq: naute-20, amp: velocity / 160.0 # Assign a lower frequency to ring mod
          end
        end
        live_loop :windy do # Use the incoming breath control, MIDI CC#2, to modulate the low-pass filter
          control_change, breath = sync "/midi/USB_Midi_Cable/4/1/control_change"
          if control_change==2
            control lipf, cutoff: breath # Breath control opens/closes the low-pass filter
            if breath==0
              control ringy, amp: 0
            end
            control tibi, pulse_width: 0.5-(breath/256.0) # Also modulate the pulse width: lower is closer to square wave
          end
        end
        live_loop :bendy do
          bend_change = sync "/midi/USB_Midi_Cable/4/1/pitch_bend" # The WX-11 sends lip pressure as pitch bend
          bent=(bend_change[0]-8192)/ 8192.0 # Convert pitch bend to -1.0 to 1.0
            control ringy, mix: (bent.abs) # Use the absolute value to modulate the ring mod mix
        end
    end
  end
end
end