diff --git a/Procfile b/Procfile
index d66f483..39a87b1 100644
--- a/Procfile
+++ b/Procfile
@@ -1 +1 @@
-pi: ssh -S none pi@pi4 'killall -v -s SIGKILL reaper jackd; sudo nice -n -20 sudo -u pi /home/pi/reaper_linux_armv7l/REAPER/reaper /home/pi/stream.RPP'
\ No newline at end of file
+pi: ssh -S none pi@pi4 'killall -v -s SIGKILL reaper jackd; sudo nice -n -20 sudo -u pi /home/pi/reaper_linux_armv7l/REAPER/reaper -nosplash /home/pi/stream.RPP'
\ No newline at end of file
diff --git a/README.md b/README.md
index 39b6575..e7183ae 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,5 @@
 This code allows to use [Raspberry Pi 4](https://www.raspberrypi.com/products/raspberry-pi-4-model-b/) as a USB gadget
-composite of Ethernet and multichannel Audio input/output.
-
-The Pi 4 is powerful enough to run [Reaper (armv7l)](https://www.reaper.fm/download.php) and its [ReaStream](https://www.reaper.fm/reaplugs/) plugin with low latency over the built-in Ethernet.
+composite of multichannel Audio input/output and Ethernet, meaning it can transform an iPad (or any other [UAC2](https://en.wikipedia.org/wiki/USB#Audio_streaming) compatible device) into a VST effect/instrument integrated into a desktop DAW – the Pi 4 is powerful enough to run [Reaper (armv7l)](https://www.reaper.fm/download.php) and its [ReaStream](https://www.reaper.fm/reaplugs/) plugin with low latency over the built-in Ethernet.
 
 ### Other versions
 * [Pi Zero](https://github.com/AlexanderPavlenko/pi-audio-duplex/tree/zero-v1)
@@ -58,7 +56,7 @@ apt install jackd2 xserver-xorg fontconfig libgtk-3-dev
 open -a xquartz # "Allow network" in Preferences / Security
 scp ~/.Xauthority pi@pi4:.
 export DISPLAY=:0 ; ssh -v -X -S none pi@pi4
-reaper_linux_armv7l/install-reaper.sh # [R]un REAPER
+sudo nice -n -20 sudo -u pi reaper_linux_armv7l/install-reaper.sh # [R]un REAPER
 ```
 
 #### Preferences
diff --git a/jack.sh b/jack.sh
index 0449ebc..73a2c70 100755
--- a/jack.sh
+++ b/jack.sh
@@ -1,3 +1,3 @@
 #!/bin/sh
 export JACK_NO_AUDIO_RESERVATION=1
-exec jackd -P70 -p16 -t2000 -dalsa -p256 -n3 -r48000 -s -dhw:CARD=UAC2Gadget,DEV=0
+exec jackd -P70 -p16 -t2000 -dalsa -p256 -n4 -r48000 -s -dhw:CARD=UAC2Gadget,DEV=0
diff --git a/stream.RPP b/stream.RPP
index 97409f9..5adde60 100644
--- a/stream.RPP
+++ b/stream.RPP
@@ -1,4 +1,4 @@
-<REAPER_PROJECT 0.1 "6.42/linux-armv7l" 1638014096
+<REAPER_PROJECT 0.1 "6.42/linux-armv7l" 1638268407
   RIPPLE 0
   GROUPOVERRIDE 0 0 0
   AUTOXFADE 1
@@ -86,58 +86,8 @@
   >
   <PROJBAY
   >
-  <TRACK {71441B9C-1C9B-E19B-B6D7-7382FAE4D9D3}
-    NAME "c 1-2"
-    PEAKCOL 16576
-    BEAT -1
-    AUTOMODE 0
-    VOLPAN 1 0 -1 -1 1
-    MUTESOLO 0 0 0
-    IPHASE 0
-    PLAYOFFS 0 1
-    ISBUS 0 0
-    BUSCOMP 0 0 0 0 0
-    SHOWINMIX 1 0.6667 0.5 1 0.5 0 -1 0
-    FREEMODE 0
-    SEL 0
-    REC 1 1024 1 2 0 0 0
-    VU 2
-    TRACKHEIGHT 0 0 0 0 0 0
-    INQ 0 0 0 0.5 100 0 0 100
-    NCHAN 2
-    FX 1
-    TRACKID {71441B9C-1C9B-E19B-B6D7-7382FAE4D9D3}
-    PERF 0
-    MIDIOUT -1
-    MAINSEND 0 0
-  >
-  <TRACK {2F4524E5-85D0-28CB-9954-87ED917D2777}
-    NAME "c 3-4"
-    PEAKCOL 16576
-    BEAT -1
-    AUTOMODE 0
-    VOLPAN 1 0 -1 -1 1
-    MUTESOLO 0 0 0
-    IPHASE 0
-    PLAYOFFS 0 1
-    ISBUS 0 0
-    BUSCOMP 0 0 0 0 0
-    SHOWINMIX 1 0.6667 0.5 1 0.5 0 -1 0
-    FREEMODE 0
-    SEL 0
-    REC 1 1026 1 2 0 0 0
-    VU 2
-    TRACKHEIGHT 0 0 0 0 0 0
-    INQ 0 0 0 0.5 100 0 0 100
-    NCHAN 2
-    FX 1
-    TRACKID {2F4524E5-85D0-28CB-9954-87ED917D2777}
-    PERF 0
-    MIDIOUT -1
-    MAINSEND 0 0
-  >
   <TRACK {5150BA6C-793A-78BE-8ED1-4CA9C481A85E}
-    NAME "c stream"
+    NAME "capture stream"
     PEAKCOL 16576
     BEAT -1
     AUTOMODE 0
@@ -149,8 +99,8 @@
     BUSCOMP 0 0 0 0 0
     SHOWINMIX 1 0.6667 0.5 1 0.5 0 -1 0
     FREEMODE 0
-    SEL 0
-    REC 0 0 1 2 0 0 0
+    SEL 1
+    REC 1 2048 1 2 0 0 0
     VU 2
     TRACKHEIGHT 0 0 0 0 0 0
     INQ 0 0 0 0.5 100 0 0 100
@@ -158,8 +108,6 @@
     FX 1
     TRACKID {5150BA6C-793A-78BE-8ED1-4CA9C481A85E}
     PERF 0
-    AUXRECV 0 1 1 0 0 0 0 0 0 -1:U 0 -1 ''
-    AUXRECV 1 1 1 0 0 0 1 0 2 -1:U 0 -1 ''
     MIDIOUT -1
     MAINSEND 0 0
     <FXCHAIN
@@ -182,7 +130,7 @@
     >
   >
   <TRACK {21087289-D58D-E5C1-9654-0FE16C4BD7C0}
-    NAME "p stream"
+    NAME "playback stream"
     PEAKCOL 16576
     BEAT -1
     AUTOMODE 0
@@ -204,7 +152,8 @@
     TRACKID {21087289-D58D-E5C1-9654-0FE16C4BD7C0}
     PERF 0
     MIDIOUT -1
-    MAINSEND 1 0
+    MAINSEND 0 0
+    HWOUT 0 3 1 0 0 0 0 -1:U -1
     <FXCHAIN
       WNDRECT 199 277 672 256
       SHOW 0
@@ -216,9 +165,8 @@
         BAAAAAAAAAAIAAAAAAAAABAAAAAAAAAAIAAAAAAAAABAAAAAAAAAAIAAAAAAAAAArAAAAAEAAAAAABAA
         AAAAAAIAAAABAAAAcGkAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
         AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==
-        AFByb2dyYW0gMQAQAAAA
+        AAAQAAAA
       >
-      PRESETNAME "Program 1"
       FLOATPOS 0 0 0 0
       FXID {BB35DE4B-39EA-A31A-65E5-C3975CEB496B}
       WAK 0 0
diff --git a/usb.sh b/usb.sh
index 86f8c9b..36861a9 100755
--- a/usb.sh
+++ b/usb.sh
@@ -2,6 +2,7 @@
 
 cd /sys/kernel/config/usb_gadget/ || fail
 mkdir -p lexi && cd lexi || fail
+#rm -rf configs/c.1/*.usb0
 
 echo 0x1d6b > idVendor # Linux Foundation
 echo 0x0104 > idProduct # Multifunction Composite Gadget
@@ -26,19 +27,24 @@ ln -s functions/ecm.usb0 configs/c.1/
 # UAC2 audio
 # https://www.kernel.org/doc/html/latest/usb/gadget-testing.html#uac2-function
 mkdir -p functions/uac2.usb0
-echo 3 > functions/uac2.usb0/c_ssize
-echo 3 > functions/uac2.usb0/p_ssize
 echo 48000 > functions/uac2.usb0/c_srate
 echo 48000 > functions/uac2.usb0/p_srate
+
 # USB Device Class Definition for Audio Devices: 4.1 Audio Channel Cluster Descriptor
-# fail: "11011110011".to_i(2) = 1779 # Side Right, Side Left, -, Front Right of Center, Front Left of Center, Back Right, Left, -, -, Front Right, Left
-# fail: "111110111".to_i(2) = 503 # Back Center, Front Right of Center, Front Left of Center, Back Right, Left, -, Front Center, Front Right, Left
-# fail: "11111111".to_i(2) = 255
-# fail: "1111111111".to_i(2) = 1023
-# works: "11110011".to_i(2) = 243 # Front Right of Center, Front Left of Center, Back Right, Left, -, -, Front Right, Left
-# but ALSA fails: "cannot set period size to 256 frames for capture"
-echo 51 > functions/uac2.usb0/c_chmask
+
+## Quality: 24 bit, 4 input + 2 output channels
+echo 51 > functions/uac2.usb0/c_chmask # "110011".to_i(2)
 echo 3 > functions/uac2.usb0/p_chmask
+echo 3 > functions/uac2.usb0/c_ssize
+echo 3 > functions/uac2.usb0/p_ssize
+
+## Quantity: 16 bit, 8 input + 8 output channels
+# fixme: 0 inputs in Reaper...
+#echo 1779 > functions/uac2.usb0/c_chmask # "11011110011".to_i(2)
+#echo 1779 > functions/uac2.usb0/p_chmask
+#echo 2 > functions/uac2.usb0/c_ssize
+#echo 2 > functions/uac2.usb0/p_ssize
+
 ln -s functions/uac2.usb0 configs/c.1/
 
 # End functions