This process was sometimes called linkage editing and the output known as a load module. A compiler works with what are sometimes called 3GL and higher-level languages. An assembler works on programs written using a processor's assembler language.
In general, however, when between vowels (as in exactamente) the Spanish x is pronounced like the English ks sound but softer or less explosive. When it comes before another consonant (as in expediciÃ³n), it has the s sound in some regions/countries but the soft ks sound in others.
X always spoke English to Germans, but his plan was to turn the sentence wrong end first and upside down, according to German construction, and sprinkle in a German word without any essential meaning to it, here and there, by way of flavor.