MixPre Series v4.01

Download v4.01


  • Limiter settings are now available in Custom Mode setups with Gain set to Advanced (MixPre-3 II, MixPre-6 II, and MixPre-10 II).


  • Improvements to SD card writing performance (all models).
  • AAC rendering of Music Projects no longer results in error (applies to all models with Music features).
  • Files with only Track R recorded now playback correctly (does not apply to M models).
  • Record Buffer Errors no longer occur after cycling power while using Record Run timecode (MixPre-10T only).
  • Various stability issues no longer occur when switching in and out of 32-bit float operation (MixPre-3 II, MixPre-6 II, MixPre-10 II).
  • Brief gap in LTC timecode output signal no longer occurs during a record split (MixPre-3 II and MixPre-6 II).
  • Timecode no longer drifts or stamps to the file with an offset. (MixPre-3 II and MixPre-6 II)
  • Various performance improvements.

Installation Instructions

Please read and follow the steps below carefully. You may want to print them before upgrading firmware.

Sound Devices recommends saving a setup file prior to loading new firmware.

Prepare to Update

  1. Download the MixPre firmware file MixPre_ 4.01.zip using the link above.
    From the zip archive, extract the file within named MixPre_ 4.01.prg file. Copy this .prg file to the root level (not within a folder) of an SD memory card that has already been formatted by the MixPre recorder.
  2. Power the MixPre via USB-C to external DC power or via “fully charged” batteries. Do not perform the update with low batteries or unstable power sources.
  3. Insert the SD card with the .prg file.
  4. Power on the MixPre.
  5. Navigate to System > Update Firmware and follow the on-screen instructions.
  6. When the update is complete the recorder will power cycle itself. The version number MixPre_ 4.01 will be displayed briefly on the splash screen while booting up. A message box appears “Firmware updated successfully Version: MixPre_ 4.01”. Tap “OK”. Please note any changes or additions to the main Menu (if applicable). Consult product documentation for details.