5. Using samples with inappropriate key and tempo
Melodic, vocal and other tonal samples are predominantly recorded in a certain key. Quality sample packs specify the key and sample in the file name. In this case you only need to adjust the audio file to the key and tempo of your track. These processes are mostly referred to as transcribing, warping and time stretching.
There are situations when a bass drum, or kick, or percussion sounds are incompatible with the mix in their key. In this case they should be processed in the same way as tonal samples. At the same time, one should be careful in doing so as excessive processing may result in artificial sound. For this reason, it is better to select a more appropriate sample than trying to adjust the one that does not match.
6. Using stylistically incompatible samples
Unless you work in some experimental genre, and if you are planning to perform for a specific target audience or work with some specific label, you should have a clear understanding of the influence of every sound used in a music work on its stylistic perception.
Imagine a completed mixed version of an electronic track in Drum & Bass genre. Then imagine replacing its kick with a softer one. You might think that one of about a hundred of different sounds used in the music setting is not likely to make any difference. But in reality, replacing a single bass drum leads to a different, much softer sound of the whole mix, which is in most cases unacceptable for a style like Drum & Bass.
7. Checking a mix against one monitor line
Novices in music production tend to believe that purchasing expensive equipment is a halfway to success. But in reality, most people listen to music using earphones or inexpensive home acoustic systems. In this case the mix that sounds perfect on the monitor may fail to do so in usual conditions. Professional producers and sound engineers always check the sound of a mixed version by listening to it in a car, via TV speakers, or even in earphones in a noisy underground. The most widespread problems concern low and ultra-low frequencies, which leads us to another typical mistake described below.