programming universal remote (to operate DAC )

I have to program a universal remote to operate my Wadia 27 DAC. I lost my remote and can’t find a used one anywhere. My question is, if I do not have the original remote (to point towards the universal remote and make it learn), is it possible to still program a universal remote through trial and error or anything?

if you have any experience with this, can you please reply. Also do you have any suggestions for a brand/model which may suit my purpose?

Thanks

Arun Rao