
Using vocal samples has a very clear advantage over recording a full vocal; you don't need to find a good singer, you don't need a microphone or a decent recording booth, and you don't need years of practise producing vocals either. You also have access to a whole world of ready-recorded material. Sites like 'acappellas4u' offer a wide selection of acappellas culled from released music, usually mp3, with varying bitrates and varying sound quality. It should be noted that it's not really legal for them to do this, and it's not actually legal for you to use them either (whether you'd actually get sued is another matter, but the likes of Soundcloud and Youtube are getting increasingly vigilant in identifying and taking down tracks that use uncleared vocal samples). So if you want to find good quality, legal vocal samples, it's often better to turn to one of the increasing number of sample packs out there that offer vocal samples. They're usually tailored to specific genres and feature gigabytes of well-recorded vocal snippets and phrases to use in your tunes. Alternatively, speak to local bands or MC's and see if you can do a remix - this will give you an original and exclusive full vocal to play to with.
In general, the stage of your tune will dictate what you want to be doing with vocal samples. If you're still working on a one-bar drum loop, then it's often fun to drop tiny, half-syllable vocal sounds quietly into the loop. Maybe an 'Ah' on one of the snares, a pitched-down hit on a kick drum somewhere, or a breath noise very quietly in the mix. If done well it can really catch the ear and make the beat more interesting (an obvious example would be the 'Think' break from the Lyn Collins track of the same name), and if you mix it quietly it will hardly even sound like a vocal sample.

A very 'current' way of using vocal samples is to chop them up into loads of little short sounds, map them across the keyboard, and then 'play' them to create a new melody (which of course doesn't really make any sense lyrically). First demonstrated back in the 1990's by the likes of Todd Edwards, then completely recontextualised in style by Burial, and since copied by every Future Garage producer from here to Croydon, this technique may soon be rather passé, but there are still original options; avoiding burying everything in reverb will certainly help.
Vocoders offer a whole wealth of fun opportunities. They're the effects units that create the 'robotic' effect and are usually pretty simple to set up; put one on your vocal track and then assign an input signal, rather like selecting a sidechain input on a compressor. The vocal will then be modulated by the input signal; so if you put a chord sound in, you'll get the classic 70's synthy vocal effect. Great for funk and soul or disco influenced tracks. Alternatively, combine with the 'chopped' technique mentioned above for some seriously other-worldy vibes. Then if you bang some heavy effects such as reverb or ring modulation on the results, you can create spacey atmospheric effects that scarcely resemble the human voice at all, but give an instant sci-fi feel to your beats.

So, it should be clear that using vocal samples doesn't just mean mashups and remixes - you can use them in any number of ways to find inspiration, add energy to your tracks and give things a new flavour without having to turn to yet another softsynth. So give your beats a new lease of life by grabbing some packs and acappellas and getting busy with the sampler!
Ready to make your tunes more vocal? Check out our vocal packs here!