... latest firmware support external trigger, but you do need to solder resistor and there is no entrance stage nor connector...
A $30 some kit or $49 assembled standalone scope is nearly unbeatable.In order to use a sound card as a scope you need a working computer, sound card, some kind of operating system, a suitable probe and software so your total cost would be way over $30-$49.
When it comes down to it, it all depends or your budget, your application, your exact requirements and what equipment and resources you already have.
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via Egeo 16