diff --git a/README.md b/README.md
index dbe5e961..f0020cc7 100644
--- a/README.md
+++ b/README.md
@@ -139,7 +139,6 @@ Driver components are responsible for calling `run` on other components. In part
 The `audio` component is the driver component for interactive audio.
 
 ## todo
-- audiobro1 why ghost drops to C?
 - audiobro2 sweeps missing?
 - stereo
 
diff --git a/assets/midis/audiobro1.mid b/assets/midis/audiobro1.mid
index 7e7bfc0d..b225e7c5 100644
Binary files a/assets/midis/audiobro1.mid and b/assets/midis/audiobro1.mid differ
diff --git a/assets/musescore/audiobro1.mscz b/assets/musescore/audiobro1.mscz
index 9723d56e..1d5167af 100644
Binary files a/assets/musescore/audiobro1.mscz and b/assets/musescore/audiobro1.mscz differ
diff --git a/assets/systems/audiobro1.py b/assets/systems/audiobro1.py
index 87c58543..0d771e9d 100644
--- a/assets/systems/audiobro1.py
+++ b/assets/systems/audiobro1.py
@@ -7,6 +7,7 @@
 parser = argparse.ArgumentParser()
 parser.add_argument('--live', '-l', action='store_true')
 parser.add_argument('--start', '-s')
+parser.add_argument('--run-size', type=int)
 args = parser.parse_args()
 
 class Voice:
@@ -48,6 +49,7 @@ def connect(self, other):
 
 # init
 driver = dlal.Audio()
+if args.run_size: driver.run_size(int(args.run_size))
 comm = dlal.Comm()
 Voice('drum', 'buf')
 Voice('piano', 'sonic', 'lfo', 'mul', 'buf_1', 'buf_2')