Software help archive
USB dropouts
Support
USB dropouts
A read-only archive of old serato.com help threads.
USB dropouts
Product
ITCH
Version
1.7.1
Hardware
Numark V7 +
Computer
PC
OS
Platform
-

DJStylus
7:16 PM - 15 June, 2011
Product: itch
Version: 1.7.1
Hardware: numark-v7||no-fx-controller
Computer: pc
OS Version: win764
---
I've optimized my system according to Serato recommended guidelines. I'm using my internal hard drive with no other programs running concurrently. When I play tracks in ITCH, the sound drops out constantly and the MIDI light comes on. The LIMITER light also comes on, but I don't know what that means and whether it's related to the dropouts. I've tried adjusting the buffer and screen refresh rate too. That doesn't help.
Scratch Live works perfectly. I've also used ITCH successfully with a VCI-300. My problem seems to be limited to ITCH with a V7.
Version: 1.7.1
Hardware: numark-v7||no-fx-controller
Computer: pc
OS Version: win764
---
I've optimized my system according to Serato recommended guidelines. I'm using my internal hard drive with no other programs running concurrently. When I play tracks in ITCH, the sound drops out constantly and the MIDI light comes on. The LIMITER light also comes on, but I don't know what that means and whether it's related to the dropouts. I've tried adjusting the buffer and screen refresh rate too. That doesn't help.
Scratch Live works perfectly. I've also used ITCH successfully with a VCI-300. My problem seems to be limited to ITCH with a V7.

DJStylus
7:33 PM - 15 June, 2011
My computer is pretty new. At first I thought it was because my last computer was old but I had the exact same problem when I took the new PC out of the box and installed Itch. I have also updated the BIOS.
More specifically what happens is not only does the sound drop out but the waveform also freezes up on screen.
As things stand, My V7 is useless right now and I have gigs I need it for.
More specifically what happens is not only does the sound drop out but the waveform also freezes up on screen.
As things stand, My V7 is useless right now and I have gigs I need it for.

DJStylus
9:41 PM - 16 June, 2011
PC specs:
2010 Lenovo ThinkPad Edge
Intel Core i5 M480 @ 2.67 GHZ
4GB RAM
500GB hard drive
Win7 64bit Home Premium
2010 Lenovo ThinkPad Edge
Intel Core i5 M480 @ 2.67 GHZ
4GB RAM
500GB hard drive
Win7 64bit Home Premium


Matt-C
10:07 PM - 16 June, 2011
Hi DJStylus.
Sorry to hear about your issues. Looking over your DPC Trace report has shown there are a few modules in the USB architecture causing a significant amount of system latency (and giving you dropouts). These are pretty standard and we will hopefully get these problems resolved with the following.
I'll list these with explanation on what to do to reduce the latency for your system:
______________________________________________________________________
NDIS.sys (Network connections)
Considering you have turned off the network already with the tweaks, you will probably need to disable all network adapters:
1) Go to Control Panel
2) Open Network and Sharing Center
3) Open 'Manage wireless networks'
4) Right click on your connections to disable the Wireless Network Connection and any wired connections.
More info: compnetworking.about.com
______________________________________________________________________
USBPORT.SYS (USB port driver)
* Try connecting to a different USB port.
* Use a different USB cable.
* Go to your computer manufacturer's website and check if there you are using the most up-to-date drivers.
* Try using an external power supply for your hardware.
______________________________________________________________________
ACPI.sys (Power management)
If you have USB dropouts and are having trouble finding a cause on a seemingly powerful machine, check if your computer is ACPI by opening the device manager:
1. Go to control panel
2. Click system
3. Click the hardware tab
4. Click device manager
5. Click the [+] next to Computer
6. If you see "ACPI uniprocessor PC" or similar, you have ACPI.
Quick method for disabling ACPI power management on some laptops
Try taking your battery out and just run off the power supply, this stops ACPI from trying to manage the battery on some model laptops.
You can disable ACPI if you think it might still be a problem:
HOWEVER IT CAN BE HARD TO REVERSE THIS, AND YOU MAY HAVE IRQ CONFLICT ERRORS, SO DON'T DO THIS UNLESS YOU KNOW WHAT YOU'RE DOING AND CAN AFFORD SOME SYSTEM DOWN-TIME! AND MAKE A BACKUP!
BEFORE PROCEEDING Make a new system restore point by using the system restore wizard in help and support (start menu).
"If you right-click on the 'Advanced Configuration and Power Interface (ACPI) PC' description and select the Properties option, and then the Driver page on the window that appears, you can select 'Update Driver'. Choose the second 'Install from a list or specific location (Advanced)' option on the subsequent page, and then the 'Don't search. I will choose the driver to install' option on the following page. This should come up with two options, namely ACPI PC and Standard PC."
(from: www.soundonsound.com)
______________________________________________________________________
I'd also suggest trying to update all your comptuer's drivers, there could be some poorly designed driver that is interfering somewhere that isn't showing up.
Sorry to hear about your issues. Looking over your DPC Trace report has shown there are a few modules in the USB architecture causing a significant amount of system latency (and giving you dropouts). These are pretty standard and we will hopefully get these problems resolved with the following.
I'll list these with explanation on what to do to reduce the latency for your system:
______________________________________________________________________
NDIS.sys (Network connections)
Considering you have turned off the network already with the tweaks, you will probably need to disable all network adapters:
1) Go to Control Panel
2) Open Network and Sharing Center
3) Open 'Manage wireless networks'
4) Right click on your connections to disable the Wireless Network Connection and any wired connections.
More info: compnetworking.about.com
______________________________________________________________________
USBPORT.SYS (USB port driver)
* Try connecting to a different USB port.
* Use a different USB cable.
* Go to your computer manufacturer's website and check if there you are using the most up-to-date drivers.
* Try using an external power supply for your hardware.
______________________________________________________________________
ACPI.sys (Power management)
If you have USB dropouts and are having trouble finding a cause on a seemingly powerful machine, check if your computer is ACPI by opening the device manager:
1. Go to control panel
2. Click system
3. Click the hardware tab
4. Click device manager
5. Click the [+] next to Computer
6. If you see "ACPI uniprocessor PC" or similar, you have ACPI.
Quick method for disabling ACPI power management on some laptops
Try taking your battery out and just run off the power supply, this stops ACPI from trying to manage the battery on some model laptops.
You can disable ACPI if you think it might still be a problem:
HOWEVER IT CAN BE HARD TO REVERSE THIS, AND YOU MAY HAVE IRQ CONFLICT ERRORS, SO DON'T DO THIS UNLESS YOU KNOW WHAT YOU'RE DOING AND CAN AFFORD SOME SYSTEM DOWN-TIME! AND MAKE A BACKUP!
BEFORE PROCEEDING Make a new system restore point by using the system restore wizard in help and support (start menu).
"If you right-click on the 'Advanced Configuration and Power Interface (ACPI) PC' description and select the Properties option, and then the Driver page on the window that appears, you can select 'Update Driver'. Choose the second 'Install from a list or specific location (Advanced)' option on the subsequent page, and then the 'Don't search. I will choose the driver to install' option on the following page. This should come up with two options, namely ACPI PC and Standard PC."
(from: www.soundonsound.com)
______________________________________________________________________
I'd also suggest trying to update all your comptuer's drivers, there could be some poorly designed driver that is interfering somewhere that isn't showing up.

DJStylus
1:21 AM - 17 June, 2011
I've updated all of my drivers, including the BIOS.
All wifi and wired network connections have been disabled.
I've tried all three of my USB ports and the V7 only works with a power supply. The USB cable is brand new.
I didn't disable the power management as described above because I wasn't confident in doing it correctly. Those instructions didn't reflect the dialogue windows on my machine. I think it's for WinXP and I'm running Win7.
The problem still persists.
I've attached a new trace report created after making the changes above.
All wifi and wired network connections have been disabled.
I've tried all three of my USB ports and the V7 only works with a power supply. The USB cable is brand new.
I didn't disable the power management as described above because I wasn't confident in doing it correctly. Those instructions didn't reflect the dialogue windows on my machine. I think it's for WinXP and I'm running Win7.
The problem still persists.
I've attached a new trace report created after making the changes above.

DJStylus
3:05 PM - 18 June, 2011
I may have a solution but it will require a bunch of testing to confirm.
Lenovo's Power Manager application may be responsible for interrupting USB flow. I saw a couple of similar posts on Lenovo's forums from DJs struggling with ThinkPads.
If I can confirm that is the issue, I will close this ticket. Hopefully you can post a sticky note or something to flag ThinkPad users to check that power app if they're having problems.
Lenovo's Power Manager application may be responsible for interrupting USB flow. I saw a couple of similar posts on Lenovo's forums from DJs struggling with ThinkPads.
If I can confirm that is the issue, I will close this ticket. Hopefully you can post a sticky note or something to flag ThinkPad users to check that power app if they're having problems.