Huh - the 555 is a "Large Dongle" ???
https://www.ap.com/blog/using-sound-cards-for-audio-measurement/
"APx500 software has supported the use of third-party ASIO audio interfaces since version 4.2. This was originally added at the request of manufacturers of these devices who wanted to be able to easily test them. Since then, we have built on the ASIO interface as a bridge to other interfaces... . In these contexts, we have already seen customers who were using ASIO for input and output, and for whom the hardware analyzer often became just a large and superfluous dongle. So, for many customers, APx500 Flex is simply a natural progression to how they were already using our audio measurement software. "
"With APx500 Flex, we are undeniably proposing that sound cards are good enough for audio measurement. This is a shift for us. That shift is driven by our acknowledgement of a ground truth. Many audio measurements do not require the exceptionally low self-noise, high input voltages, or vanishingly small distortion available from APx hardware analyzers. "
https://www.ap.com/blog/using-sound-cards-for-audio-measurement/
"APx500 software has supported the use of third-party ASIO audio interfaces since version 4.2. This was originally added at the request of manufacturers of these devices who wanted to be able to easily test them. Since then, we have built on the ASIO interface as a bridge to other interfaces... . In these contexts, we have already seen customers who were using ASIO for input and output, and for whom the hardware analyzer often became just a large and superfluous dongle. So, for many customers, APx500 Flex is simply a natural progression to how they were already using our audio measurement software. "
"With APx500 Flex, we are undeniably proposing that sound cards are good enough for audio measurement. This is a shift for us. That shift is driven by our acknowledgement of a ground truth. Many audio measurements do not require the exceptionally low self-noise, high input voltages, or vanishingly small distortion available from APx hardware analyzers. "
