Making the helix floor guitar unit work for reamping on ubuntu studio eoan 19.10 with jack

helix-reamping-on-ubuntu-eoan.md

Making the Helix floor guitar unit work for reamping on ubuntu studio eoan 19.10 with jack

• clone the repo git://kernel.ubuntu.com/ubuntu/ubuntu-eoan.git
• as lsusb shows the Helix as Bus 003 Device 019: ID 0e41:4248 Line6, Inc. HELIX, this switch https://github.com/torvalds/linux/blob/d4bd30532688558a7de70f0c8edd2a7a25c3963f/sound/usb/format.c#L307 will need a case for USB_ID(0e41, 0x4248) as well
• add this line to case USB_ID(0x0E41, 0x4248): /* Line6 Helix Floor */ to the switch statement in sound/usb/format.c
• drop the Makefile below into sound/usb/

KVERSION = $(shell uname -r)

snd-usb-audio-objs := 	card.o \
			clock.o \
			endpoint.o \
			format.o \
			helper.o \
			mixer.o \
			mixer_quirks.o \
			mixer_scarlett.o \
			mixer_us16x08.o \
			pcm.o \
			power.o \
			proc.o \
			quirks.o \
			stream.o \
			validate.o

# this is different on eoan from jens' file
snd-usb-audio-m += media.o

obj-m += snd-usb-audio.o snd-usbmidi-lib.o

snd-usbmidi-lib-objs := midi.o

all:
	make -C /lib/modules/$(KVERSION)/build M=$(PWD) modules

clean:
	make -C /lib/modules/$(KVERSION)/build M=$(PWD) clean

• run make -j8
• backup the files snd-usb-audio.ko and snd-usbmidi-lib.ko

KVERSION=`uname -r`
sudo mv /lib/modules/$KVERSION/kernel/sound/usb/snd-usb-audio.ko /lib/modules/$KVERSION/kernel/sound/usb/snd-usb-audio.ko.orig
sudo mv /lib/modules/$KVERSION/kernel/sound/usb/snd-usbmidi-lib.ko /lib/modules/$KVERSION/kernel/sound/usb/snd-usbmidi-lib.ko.orig

• copy the newly created files snd-usb-audio.ko and snd-usbmidi-lib.ko into place

KVERSION=`uname -r`
sudo cp snd-usb-audio.ko /lib/modules/$KVERSION/kernel/sound/usb/
sudo cp snd-usbmidi-lib.ko /lib/modules/$KVERSION/kernel/sound/usb/

• reboot
• the helix should appear as an audio interface when running ubuntustudio-controls
• select the HELIX as the USB device that should be master and set the sample rate to 48000
• with jack, connect the "system" (i.e. the helix) ports 1 and 2 to your daw for your processed guitar sound, and ports 7 and 8 to your daw for your unprocessed guitar sound. Make sure you also send the output from 7 and 8 from your daw out to your helix, so you can use USB7/8 as an input in your patch when reamping

jens's helix_patch_and_module_replace.sh

https://line6.com/support/topic/4426-line-6-with-linux/?do=findComment&comment=310804

This script was used for inspiration, adapted to work with ubuntu eoan 19.10, e.g. I could not make sudo rmmod work

#!/bin/bash


KVERSION=`uname -r`
MAKEOPTS="-j"$(( `grep processor /proc/cpuinfo | wc -l`))
SCRIPTDIR=$PWD
SOURCEDIR=$SCRIPTDIR/..

PAUSE=2

echo "Active Kernel: $KVERSION"

echo "Do you want apply the helix patch ?"
echo Proceed ? \(y/n\) \( + return \)
read helix

if [ "$helix" != "y" ]
then echo aborting
else echo Applying patch ...
cp $PWD/helix_clock_patch.txt $PWD/../
cd $SOURCEDIR
if ! patch -p1 < helix_clock_patch.txt ; then
echo " !!! Patching failed !!! "
else
echo " * Patching successfully"
fi
cd $SCRIPTDIR
fi

echo "Do you want apply the scarlett6i6 patch ?"
echo Proceed ? \(y/n\) \( + return \)
read scarlett

if [ "$scarlett" != "y" ]
then echo aborting
else echo Applying patch ...
cp $PWD/scarlett6i6rev1_gain.txt $PWD/../
cd $SOURCEDIR
if ! patch -p1 < scarlett6i6rev1_gain.txt ; then
echo " !!! Patching failed !!! "
else
echo " * Patching successfully"
fi
cd $SCRIPTDIR
fi

echo "Do you want to compile snd_usb_audio module ?"
echo Proceed ? \(y/n\) \( + return \)
read module

if [ "$module" != "y" ]
then echo aborting
else echo Renaming and replacing makefile ...
# make sure orig never gets lost.
if ! find $PWD/../sound/usb/Makefile.orig ; then
mv $PWD/../sound/usb/Makefile $PWD/../sound/usb/Makefile.orig
fi
sleep $PAUSE
cp Makefile.usb_audio $PWD/../sound/usb/Makefile
sleep $PAUSE
cd $SOURCEDIR
#	echo Setting up config ...
#	cp /boot/config-$KVERSION .config
#	sleep $PAUSE
#	make oldconfig
sleep $PAUSE
echo "Compiling with $MAKEOPTS threads"
cd $SOURCEDIR/sound/usb
make $MAKEOPTS
fi

echo "Do you want to replace the active module now ?"
echo Proceed ? \(y/n\) \( + return \)
read modulerpl

if [ "$modulerpl" != "y" ]
then echo aborting
else echo Unloading module ...
sudo rmmod snd-usb-audio
sleep $PAUSE
echo Renaming and replacing module ...
cd $SOURCEDIR/sound/usb
# make sure orig never gets lost.
if ! find /lib/modules/$KVERSION/kernel/sound/usb/snd-usb-audio.ko.orig ; then
sudo mv /lib/modules/$KVERSION/kernel/sound/usb/snd-usb-audio.ko /lib/modules/$KVERSION/kernel/sound/usb/snd-usb-audio.ko.orig
sudo mv /lib/modules/$KVERSION/kernel/sound/usb/snd-usbmidi-lib.ko /lib/modules/$KVERSION/kernel/sound/usb/snd-usbmidi-lib.ko.orig
fi
sleep $PAUSE
sudo cp $PWD/snd-usb-audio.ko /lib/modules/$KVERSION/kernel/sound/usb/
sudo cp $PWD/snd-usbmidi-lib.ko /lib/modules/$KVERSION/kernel/sound/usb/
sleep $PAUSE
echo Loading module ...
sudo modprobe snd-usb-audio
sleep $PAUSE
dmesg|tail
fi

exit