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might indeed be better.
In answer to your previous questions:
1,2,4 & 5
As frequently discussed elsewhere on this forum, you are correct that those features are not currently included in PS6. It is intended to eventually incorporate the majority of PS5 features into PS6 but, it is not possible for me to define the order of implementation or timescales involved.
PS5 and PS6 can co-exist on your computer, therefore, you may use whichever is more suited to your application but, not at the same time.
The application note refers to the ADC-216 which was a purpose built 16-bit audio oscilloscope. Nonetheless, you may still obtain a good flat spectrum using the PS3224.
The attached trace is from a PS3224 set for a spectrum range of 39.06Khz with 8192 bins and 'peak hold'.
The sweep generator is the PS5000 internal generator, set to sweep from 20Hz to 20Khz at 100Hz increments every 1ms.
Custom install puts programming examples in the Program folder of your hard drive.
I trust that this is helpul.