Mustang GT 40: No device found

[callmemagnus]

Mustang GT 40: No device found

[offa]

The device PID isn't supported and not listed here. The main question is though: Does it use the Mustang protocol, or something different like the LT series?

I took to ownership of the AUR package for this plugin as the previous versions did not compile anymore.

Nice, thank you! 😃

[callmemagnus]

Ha! I didn't see the list... Shame on me.

Regarding the similarity with the LT, I don't know, both products look surprisingly similar from an external point of view.

I've only used the Fender Tone android App to access it via Bluetooth.

I now wonder if the GT provides anything more than an audio interface over USB... I will check that.

[offa]

You can do a simple test:

1. Add the PID 0032 to the linked code
2. compile, run and see how far you get / where it fails

[callmemagnus]

I added

diff --git a/src/com/ConnectionFactory.cpp b/src/com/ConnectionFactory.cpp
index 6c52c31..71b6b2d 100644
--- a/src/com/ConnectionFactory.cpp
+++ b/src/com/ConnectionFactory.cpp
@@ -41,6 +41,7 @@ namespace plug::com
             inline constexpr std::uint16_t mustangFloor{0x0012};
             inline constexpr std::uint16_t mustangI_II_v2{0x0014};
             inline constexpr std::uint16_t mustangIII_IV_V_v2{0x0016};
+            inline constexpr std::uint16_t mustangGT_40{0x0032};
         }
 
         inline constexpr std::initializer_list<std::uint16_t> pids{
@@ -50,7 +51,8 @@ namespace plug::com
             usbPID::mustangMini,
             usbPID::mustangFloor,
             usbPID::mustangI_II_v2,
-            usbPID::mustangIII_IV_V_v2};
+            usbPID::mustangIII_IV_V_v2,
+            usbPID::mustangGT_40};
 
         DeviceModel getModel(std::uint16_t pid)
         {
@@ -70,6 +72,8 @@ namespace plug::com
                     return DeviceModel{"Mustang I/II", DeviceModel::Category::MustangV2, 24};
                 case usbPID::mustangIII_IV_V_v2:
                     return DeviceModel{"Mustang III/IV/V", DeviceModel::Category::MustangV2, 100};
+                case usbPID::mustangGT_40:
+                    return DeviceModel{"Mustang GT40", DeviceModel::Category::MustangV2, 100};
                 default:
                     throw CommunicationException{"Unknown device pid: " + std::to_string(pid)};
             }

Last changed line: total guess!

I also added the productId in a udev file rule with:

ATTRS{idVendor}=="1ed8", ATTRS{idProduct}=="0032", ENV{ID_AUDIO_MODELING_AMP}="1", MODE="0666"

Running the compiled version:

$ LIBUSB_DEBUG=4 ./src/plug                                         
[timestamp] [threadID] facility level [function call] <message>
--------------------------------------------------------------------------------
[ 0.000019] [000fd316] libusb: debug [libusb_init_context] created default context
[ 0.000024] [000fd316] libusb: debug [libusb_init_context] libusb v1.0.27.11882
[ 0.000031] [000fd316] libusb: debug [usbi_add_event_source] add fd 16 events 1
[ 0.000037] [000fd316] libusb: debug [usbi_io_init] using timer for timeouts
[ 0.000040] [000fd316] libusb: debug [usbi_add_event_source] add fd 17 events 1
[ 0.000047] [000fd316] libusb: debug [get_kernel_version] reported kernel version is 6.6.16-2-MANJARO
[ 0.000065] [000fd316] libusb: debug [op_init] found usbfs at /dev/bus/usb
[ 0.000069] [000fd316] libusb: debug [op_init] max iso packet length is (likely) 98304 bytes
[ 0.000074] [000fd316] libusb: debug [op_init] sysfs is available
[ 0.000250] [000fd31d] libusb: debug [linux_udev_event_thread_main] udev event thread entering
[ 0.005661] [000fd316] libusb: debug [linux_get_device_address] getting address for device: usb1 detached: 0
[ 0.005669] [000fd316] libusb: debug [linux_get_device_address] scan usb1
[ 0.005693] [000fd316] libusb: debug [linux_get_device_address] bus=1 dev=1
[ 0.005697] [000fd316] libusb: debug [linux_enumerate_device] busnum 1 devaddr 1 session_id 257
[ 0.005713] [000fd316] libusb: debug [linux_enumerate_device] allocating new device for 1/1 (session 257)
[ 0.005795] [000fd316] libusb: debug [linux_get_device_address] getting address for device: 1-2 detached: 0
[ 0.005799] [000fd316] libusb: debug [linux_get_device_address] scan 1-2
[ 0.005821] [000fd316] libusb: debug [linux_get_device_address] bus=1 dev=16
[ 0.005823] [000fd316] libusb: debug [linux_enumerate_device] busnum 1 devaddr 16 session_id 272
[ 0.005827] [000fd316] libusb: debug [linux_enumerate_device] allocating new device for 1/16 (session 272)
[ 0.005849] [000fd316] libusb: debug [linux_get_parent_info] dev 0x55a5a14a4d50 (1-2) has parent 0x55a5a14eefa0 (usb1) port 2
[ 0.005922] [000fd316] libusb: debug [linux_get_device_address] getting address for device: 1-3 detached: 0
[ 0.005929] [000fd316] libusb: debug [linux_get_device_address] scan 1-3
[ 0.005955] [000fd316] libusb: debug [linux_get_device_address] bus=1 dev=2
[ 0.005959] [000fd316] libusb: debug [linux_enumerate_device] busnum 1 devaddr 2 session_id 258
[ 0.005962] [000fd316] libusb: debug [linux_enumerate_device] allocating new device for 1/2 (session 258)
[ 0.005987] [000fd316] libusb: debug [linux_get_parent_info] dev 0x55a5a14ef0c0 (1-3) has parent 0x55a5a14eefa0 (usb1) port 3
[ 0.006052] [000fd316] libusb: debug [linux_get_device_address] getting address for device: 1-4 detached: 0
[ 0.006056] [000fd316] libusb: debug [linux_get_device_address] scan 1-4
[ 0.006078] [000fd316] libusb: debug [linux_get_device_address] bus=1 dev=3
[ 0.006080] [000fd316] libusb: debug [linux_enumerate_device] busnum 1 devaddr 3 session_id 259
[ 0.006083] [000fd316] libusb: debug [linux_enumerate_device] allocating new device for 1/3 (session 259)
[ 0.006104] [000fd316] libusb: debug [linux_get_parent_info] dev 0x55a5a14a4a50 (1-4) has parent 0x55a5a14eefa0 (usb1) port 4
[ 0.006162] [000fd316] libusb: debug [linux_get_device_address] getting address for device: 1-4.1 detached: 0
[ 0.006165] [000fd316] libusb: debug [linux_get_device_address] scan 1-4.1
[ 0.006188] [000fd316] libusb: debug [linux_get_device_address] bus=1 dev=4
[ 0.006192] [000fd316] libusb: debug [linux_enumerate_device] busnum 1 devaddr 4 session_id 260
[ 0.006195] [000fd316] libusb: debug [linux_enumerate_device] allocating new device for 1/4 (session 260)
[ 0.006218] [000fd316] libusb: debug [linux_get_parent_info] dev 0x55a5a14a5b30 (1-4.1) has parent 0x55a5a14a4a50 (1-4) port 1
[ 0.006276] [000fd316] libusb: debug [linux_get_device_address] getting address for device: 1-4.4 detached: 0
[ 0.006278] [000fd316] libusb: debug [linux_get_device_address] scan 1-4.4
[ 0.006299] [000fd316] libusb: debug [linux_get_device_address] bus=1 dev=6
[ 0.006301] [000fd316] libusb: debug [linux_enumerate_device] busnum 1 devaddr 6 session_id 262
[ 0.006304] [000fd316] libusb: debug [linux_enumerate_device] allocating new device for 1/6 (session 262)
[ 0.006330] [000fd316] libusb: debug [linux_get_parent_info] dev 0x55a5a14a5a10 (1-4.4) has parent 0x55a5a14a4a50 (1-4) port 4
[ 0.006382] [000fd316] libusb: debug [linux_get_device_address] getting address for device: usb2 detached: 0
[ 0.006385] [000fd316] libusb: debug [linux_get_device_address] scan usb2
[ 0.006406] [000fd316] libusb: debug [linux_get_device_address] bus=2 dev=1
[ 0.006409] [000fd316] libusb: debug [linux_enumerate_device] busnum 2 devaddr 1 session_id 513
[ 0.006412] [000fd316] libusb: debug [linux_enumerate_device] allocating new device for 2/1 (session 513)
[ 0.006482] [000fd316] libusb: debug [linux_get_device_address] getting address for device: usb3 detached: 0
[ 0.006486] [000fd316] libusb: debug [linux_get_device_address] scan usb3
[ 0.006507] [000fd316] libusb: debug [linux_get_device_address] bus=3 dev=1
[ 0.006510] [000fd316] libusb: debug [linux_enumerate_device] busnum 3 devaddr 1 session_id 769
[ 0.006513] [000fd316] libusb: debug [linux_enumerate_device] allocating new device for 3/1 (session 769)
[ 0.006581] [000fd316] libusb: debug [linux_get_device_address] getting address for device: 3-2 detached: 0
[ 0.006585] [000fd316] libusb: debug [linux_get_device_address] scan 3-2
[ 0.006606] [000fd316] libusb: debug [linux_get_device_address] bus=3 dev=2
[ 0.006609] [000fd316] libusb: debug [linux_enumerate_device] busnum 3 devaddr 2 session_id 770
[ 0.006611] [000fd316] libusb: debug [linux_enumerate_device] allocating new device for 3/2 (session 770)
[ 0.006635] [000fd316] libusb: debug [linux_get_parent_info] dev 0x55a5a14a4bf0 (3-2) has parent 0x55a5a14a6340 (usb3) port 2
[ 0.006688] [000fd316] libusb: debug [linux_get_device_address] getting address for device: usb4 detached: 0
[ 0.006690] [000fd316] libusb: debug [linux_get_device_address] scan usb4
[ 0.006711] [000fd316] libusb: debug [linux_get_device_address] bus=4 dev=1
[ 0.006715] [000fd316] libusb: debug [linux_enumerate_device] busnum 4 devaddr 1 session_id 1025
[ 0.006717] [000fd316] libusb: debug [linux_enumerate_device] allocating new device for 4/1 (session 1025)
[ 0.078059] [000fd316] libusb: debug [libusb_get_device_list]  
[ 0.078087] [000fd316] libusb: debug [libusb_get_device_descriptor]  
[ 0.078090] [000fd316] libusb: debug [libusb_get_device_descriptor]  
[ 0.078093] [000fd316] libusb: debug [libusb_get_device_descriptor]  
[ 0.078097] [000fd316] libusb: debug [libusb_get_device_descriptor]  
[ 0.078100] [000fd316] libusb: debug [libusb_get_device_descriptor]  
[ 0.078102] [000fd316] libusb: debug [libusb_get_device_descriptor]  
[ 0.078107] [000fd316] libusb: debug [libusb_get_device_descriptor]  
[ 0.078110] [000fd316] libusb: debug [libusb_get_device_descriptor]  
[ 0.078114] [000fd316] libusb: debug [libusb_get_device_descriptor]  
[ 0.078116] [000fd316] libusb: debug [libusb_get_device_descriptor]  
[ 0.078124] [000fd316] libusb: debug [libusb_open] open 1.16
[ 0.078151] [000fd316] libusb: debug [usbi_add_event_source] add fd 24 events 4
[ 0.078156] [000fd316] libusb: debug [libusb_claim_interface] interface 0
[ 0.078459] [000fd316] libusb: debug [libusb_submit_transfer] transfer 0x55a5a1a813f0
[ 0.078469] [000fd316] libusb: debug [add_to_flying_list] arm timer for timeout in 1000ms (first in line)
[ 0.078495] [000fd316] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.078498] [000fd316] libusb: debug [handle_events] event sources modified, reallocating event data
[ 0.078503] [000fd316] libusb: debug [usbi_wait_for_events] poll() 3 fds with timeout in 60000ms
[ 0.078837] [000fd316] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.078847] [000fd316] libusb: debug [reap_for_handle] urb type=2 status=0 transferred=4
[ 0.078851] [000fd316] libusb: debug [handle_control_completion] handling completion status 0
[ 0.078855] [000fd316] libusb: debug [arm_timer_for_next_timeout] no timeouts, disarming timer
[ 0.078860] [000fd316] libusb: debug [usbi_handle_transfer_completion] transfer 0x55a5a1a813f0 has callback 0x7fd1d1679c90
[ 0.078863] [000fd316] libusb: debug [sync_transfer_cb] actual_length=4
[ 0.078869] [000fd316] libusb: debug [libusb_free_transfer] transfer 0x55a5a1a813f0
[ 0.078873] [000fd316] libusb: debug [libusb_submit_transfer] transfer 0x55a5a1a814e0
[ 0.078877] [000fd316] libusb: debug [add_to_flying_list] arm timer for timeout in 1000ms (first in line)
[ 0.078887] [000fd316] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.078890] [000fd316] libusb: debug [usbi_wait_for_events] poll() 3 fds with timeout in 60000ms
[ 0.079202] [000fd316] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.079211] [000fd316] libusb: debug [reap_for_handle] urb type=2 status=0 transferred=56
[ 0.079214] [000fd316] libusb: debug [handle_control_completion] handling completion status 0
[ 0.079217] [000fd316] libusb: debug [arm_timer_for_next_timeout] no timeouts, disarming timer
[ 0.079221] [000fd316] libusb: debug [usbi_handle_transfer_completion] transfer 0x55a5a1a814e0 has callback 0x7fd1d1679c90
[ 0.079225] [000fd316] libusb: debug [sync_transfer_cb] actual_length=56
[ 0.079228] [000fd316] libusb: debug [libusb_free_transfer] transfer 0x55a5a1a814e0
[ 0.079254] [000fd316] libusb: debug [libusb_submit_transfer] transfer 0x55a5a1a81720
[ 0.079258] [000fd316] libusb: debug [add_to_flying_list] arm timer for timeout in 500ms (first in line)
[ 0.079263] [000fd316] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 64
[ 0.079268] [000fd316] libusb: error [submit_bulk_transfer] submiturb failed, errno=2
[ 0.079272] [000fd316] libusb: debug [submit_bulk_transfer] first URB failed, easy peasy
[ 0.079275] [000fd316] libusb: debug [arm_timer_for_next_timeout] no timeouts, disarming timer
[ 0.079279] [000fd316] libusb: debug [libusb_free_transfer] transfer 0x55a5a1a81720
ERROR:  Input/Output Error
``

[offa]

That's a different error than expected. Do you get this error each time?

[callmemagnus]

No. If I start the application, I get the IO Error.
If I then use the "Connect" entry in the menu, I get the following error:

...
[ 0.074970] [0019426b] libusb: debug [add_to_flying_list] arm timer for timeout in 500ms (first in line)
[ 0.074980] [0019426b] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 64
[ 0.074989] [0019426b] libusb: error [submit_bulk_transfer] submiturb failed, errno=2
[ 0.074994] [0019426b] libusb: debug [submit_bulk_transfer] first URB failed, easy peasy
[ 0.075001] [0019426b] libusb: debug [arm_timer_for_next_timeout] no timeouts, disarming timer
[ 0.075010] [0019426b] libusb: debug [libusb_free_transfer] transfer 0x562bfbe01c70
ERROR:  Input/Output Error
[ 3.716230] [0019426b] libusb: debug [libusb_get_device_list]  
[ 3.716255] [0019426b] libusb: debug [libusb_get_device_descriptor]  
[ 3.716259] [0019426b] libusb: debug [libusb_get_device_descriptor]  
[ 3.716261] [0019426b] libusb: debug [libusb_get_device_descriptor]  
[ 3.716265] [0019426b] libusb: debug [libusb_get_device_descriptor]  
[ 3.716267] [0019426b] libusb: debug [libusb_get_device_descriptor]  
[ 3.716271] [0019426b] libusb: debug [libusb_get_device_descriptor]  
[ 3.716275] [0019426b] libusb: debug [libusb_get_device_descriptor]  
[ 3.716278] [0019426b] libusb: debug [libusb_get_device_descriptor]  
[ 3.716282] [0019426b] libusb: debug [libusb_get_device_descriptor]  
[ 3.716286] [0019426b] libusb: debug [libusb_get_device_descriptor]  
[ 3.716293] [0019426b] libusb: debug [libusb_open] open 1.18
[ 3.716327] [0019426b] libusb: debug [usbi_add_event_source] add fd 27 events 4
[ 3.716331] [0019426b] libusb: debug [libusb_claim_interface] interface 0
[ 3.716361] [0019426b] libusb: debug [libusb_release_interface] interface 0
[ 3.716367] [0019426b] libusb: debug [libusb_close]  
[ 3.716371] [0019426b] libusb: debug [usbi_remove_event_source] remove fd 27
ERROR:  Resource busy

[offa]

This might be an indication of a different protocol. Usually it should fail with some kind of 'invalid id', not on USB writing.

[callmemagnus]

That is sad news.