iPod Classic at Sensus: how much GB to run / letter search

I would like to know how the iPod Classic works in the sense of MJ11 or 12: Can Sensus handle a bulging iPod Classic 160 GB? What about the search function: can individual letters (e.g. initial letters of the interpreters) be controlled here? In older posts it is often stated that the letter search function does not work, but in my V70 MJ 2012 the letter search works if I attach HD or USB stick (with other problems…: ). So, who offers the most GB and up to which letter can you search?