Hello Ziko, and thanks.
The trouble I have with this laptop / nootebook is electrical noise and a lack of frequency response (it is, afterall, a lower end machine that's at least 10 years old).
In addition I have to use the switching PSU cos the battery's had it: the PSU generates loads of noise! I need to go down to 20 Hz but the sound chip clearly won't. There's all sorts of unwanted noise on the signal returns vs mains earth, etc, etc. If it was a desktop machine in a shielded case with a good sound card, etc, things may well be fine.
I suspected that by taking this basic sound 'card' from the equation and, in effect, replacing it with a USB system, all may be well. That was my path of thought in considering a pico product. But in the end I don't have to retain the laptop. I could buy a scope but id sooner use good but old gear if it were possible!