Infection Music Limited
Electronic Musical Instruments

This page contains software to support and maintain all first and second generation ZEIT and ATEM step sequencers.

ZEIT Software Release 02-10 (in progress)

Bugs fixed / resolved in software release 02-10, which is the next major milestone, to be released Q4 2023:

  • Fixed bug that would stop the encoder updating the Note Pitch and velocity for a sequence
  • Fixed bug that would stop tempo updates under certain circumstances
  • Improved error reporting - added new routines to display error messages to both the Serial debug port and the VFD so that the user can provide more information when something has failed
  • The sequencer will now run normally without the SD card
  • Report missing SD Card to the user
  • Report missing FAT16/FAT32 partition when reading SD Card for the first time
  • Report bad SD Card type on power up
  • Improved efficiency of the encoder handler
  • Changed behaviour of Gate Length parameter to correctly indicate tied notes
  • LEDs refresh properly when changing between shift mode and normal mode
  • Menu select LEDs now behave properly
  • Patch Menu LED now displays properly after booting
  • Expanded keyboard debugging tools for beta-tester machines
  • Playback LED now flashes consistently across end of sequence
  • Improved response of the step LEDs (slightly behind beat)
  • Improved error reporting when internal queues block back
  • Improved error reporting when there’s no space left in the note output queue
  • Improved error reporting when there’s no space left in the controller output queue
  • Fix NoteWrap calculation which would generate bogus notes when the Midi note was above the Upper Wrap limit.
  • When sending a Midi Controller message, don’t just send Midi Volume messages.
  • Only send Midi Data if a track is enabled. If the track is muted then don’t send anything.
  • Controller One and Controller Two streams can be enabled and disabled properly
  • The Note Stream can now be enabled and disabled
  • In the vanilla record, the Controller Two stream is disabled by default to prevent flooding the Midi bus with too many controller messages
  • Octave Range now works as it should.
  • When editing a step, the step number is accurately shown on the display
  • When editing the values for a particular step, the step number no longer flickers in the main display.

List updated : 29-Nov-23

Available Downloads

  • December 2023 : ZEIT Software version 02-09

    This firmware is the current version for the second generation of ZEIT STEP sequencers.



    ZEIT Rack 02-09
  • December 2023 : ZEIT Software version 01-41

    Version 01-41 was the final software release for the first generation of ZEIT STEP sequencers. This software is no longer supported.

    ZEIT Rack 16 MHz 01-41
    ZEIT Rack 8 MHz 01-41
    ZEIT Desktop 16 MHz 01-41
    ZEIT Desktop 8 MHz 01-41

  • December 2023 : ATEM Software version 01-06

    Version 01-06 was the final software release for the first generation of ATEM STEP sequencers. This software is no longer supported.


    ATEM Rack 01-06
  • December 2023 : ZEIT Operating Manual

    This is the operating manual for the first generation of ZEIT STEP sequencers and applies to software release 01-41.


    ZEIT Manual 01-41

Contact Infection Music

You can contact Customer Services by clicking here.

Please note that Customer Support hours are (for the time being) Monday - Thursday : 0830 - 1730, Friday : 0830 - 1330.

The Customer Support Office is closed Saturday and Sunday, and all major holidays.