Cyllian

Hi everybody - I am sure his has been covered before but I am using a 1992 Ibanez ex160 on rocksmith. I have noticed that I am having a hard time hitting notes including the open E string in songs. sometimes it registers and sometimes it doesnt. I have tried various levels of pressure on the strings and I am starting to think that I need a different guitar. I even took it to the local guitar center for a tune up which improved it but I am still having issues. so here is my questions...should I buy a different guitar? if so which guitars work the best? Thanks