Field guide to determining Modi MB or Bifrost MB v1 or v2 version firmware This procedure requires some DIY ability and willingness to acquire appropriate HW & SW. Required: 1. Soundcard I/O with at least 16 bit A/D input 2. Digital Scope program The Behringer UCA202 $30 US is an inexpensive USB 16 bit A/D and D/A that works well enough for this purpose: https://www.amazon.com/BEHRINGER-U-Control-Low-Latency-Interface-Digital/dp/B000KW2YEI Christian Zeitnitz created a very useful soundcard oscilloscope that can be found here: https://www.zeitnitz.eu/scope_en It would be good to give him a virtual beer+inexpensive meal (Soundcard Scope $14 US) as a thank-you: http://www.shareit.com/product.html?productid=300341154 This combination of HW+SW provides a very low cost Signal Generator / Oscilloscope combination. Very useful for continued education and experimentation. When using the UCA202 assure that the driver is correctly configured: 1. select the UCA202 driver 2. levels should be set to 100 3. default shared mode should be 2 channel, 44 KHz, 16 bit. Verify both boxes are checked. Connect DAC outputs to soundcard inputs (monitor switched off): Soundcard Scope setup: 1. select appropriate input and output devices 2. adjust signal generator for 440 Hz and amplitude of 0.0000316 (-90 dBFS). After entering this value press Enter key. The display will return 0.000. Don't worry. It has been adjusted but doesn't display beyond 3 digits past the decimal point. Remember to enable the signal generator. 3. Adjust scope parameters as shown in the screenshot 1.5m amplitude 8.0m time base normal trigger trigger on Modi / Bifrost MB with v1 firmware display (no evidence of a sine wave) Modi / Bifrost MB with v2 firmware display (sine wave apparent in display) In my setup channel 1 was used for a Modi MB DAC with v2 firmware and channel 2 for v1 firmware (separate, additional DAC) so I could capture both simultaneously. I did this for my convenience. Only channel 1 is necessary for determination.