i've been looking into buying a double bass but i've not got a huge amount of money just now. there's 2 at a music shop near me. one's a full size but it's 1 and a half grand, the other's only 400 pound but it's 1/4. does this mean it's a quarter of the size? or is it something to do with the fretboard? what i'm trying to find out is if i should get this one and learn on that or just save for the full size one, will it make any difference?