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KeyStudio 49i User Guide
Troubleshooting
18
KeyStudio 49i is a quality, versatile MIDI controller that has been tested under a wide variety of conditions. In the event that you
experience difficulty with your KeyStudio, this section covers some common issues and tips to help remedy problems.
Problem 1: My KeyStudio keyboard suddenly stopped working after having performed fine since installation.
Solution 1: Close any music applications you are using, switch KeyStudio off, and restart your computer. Once your
computer has completely restarted, switch KeyStudio back on.
Problem 2: I have connected a sustain pedal to my M-Audio keyboard, but its function is reversed.
Solution 2: The polarity of the sustain pedal is calculated by the keyboard when it is powered up. On power up, the sustain
pedal is assumed to be in the OFF position. If you want the sustain pedal to be off when it is not pressed, make sure the pedal
is not pressed when you power up. Also check to see if there is a polarity switch on your foot pedal. It is possible to use this
switch to change foot pedal polarity as well. Another way to intentionally reverse the sustain pedal’s operation is to keep it
pushed while powering on your KeyStudio keyboard.
Problem 3: When I press a key, or attempt to monitor my microphone or instrument input, there is a noticeable delay
before I hear any sound.
Solution 3: This delay is known as latency, and latency can be adjusted by changing the buffer size setting in your M-Audio
Control Panel. The goal is to set the buffer size as low as possible without experiencing artifacts in the audio. Faster
computers generally allow for smaller buffer size settings, and thus less latency. You can also avoid this problem by using the
Direct Monitor knob. See the “Using Direct Monitoring” section in the “Audio Setup and Control” portion of this User Guide
for more information on this.
Problem 4: I cannot locate the KeyStudio USB keyboard in my software’s MIDI devices dialog box.
Solution 4: KeyStudio requires a powered USB port. Try plugging KeyStudio into a different USB port or powered USB hub
connected to your computer.
Problem 5: I connected KeyStudio 49i to my Windows computer and noticed that a question mark appears in the
Windows Device Manager under Other Devices > M-Audio DFU. Does this indicate that there is a problem with
KeyStudio 49i?
Solution 5: Your new keyboard functions as a class-compliant device. This means that upon connecting KeyStudio 49i to
your computer, KeyStudio will function as expected without the need to install additional drivers. Installing the KeyStudio 49i
drivers extends the keyboard’s functionality, allowing large SysEx transfers, and multi-client support. M-Audio DFU (device
firmware upgrade tool) is an additional component that is enabled when the KeyStudio 49i drivers are installed.