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Latest information
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The most recent versions of the System / Drive firmware are as follows.

System firmware:V1.01 (Previously V1.00. Updated at this time)

Drive firmware: VT.4A (Not Updated at this time)

Always use the most recent firmware version for this unit.
For information about the latest firmware, visit the TEAC Global Site.
 < https://tascam.jp/int/product/cd-rw900sx/support >
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System firmware: V1.01 (April, 15 2024)
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< Maintenance items >
 - When the sampling rate converter (SRC) was turned on and digital input signals other than 44.1 kHz were recorded, 
   noise would be recorded about 20 seconds after recording started.
   This has been fixed.

[Note]
 - In order to stabilize the digital input signal, it may take some time for the unit to enter recording standby mode. 
   In this case, "Clock Check" will appear on the display.

 - The input signal selection (INPUT SELECT) and sampling rate converter (SRC) settings cannot be changed during recording standby.