Abstract: A method of synthesizing audio signals provides outputs of high subjective quality which retain the semblance of natural origin. Unlike frequency scaling methods, the pitch of a signal can be modified independently of the spectrum envelope. A set of candidate input sections is defined based on input transform-domain signal representations. A match-output transform-domain section is formed using the result of a matching process which compares candidate input sections to a reference section. The reference section for this matching process is defined based on one or more previously formed match-output sections. Main-output transform-domain signal representations are formed based on one or more match-output sections, whereby such main-output transform-domain signal representations can be inverse-transformed and combined with the output time-domain signal. This method is referred to as "Transform-Domain Match-Output Extension" (TDMOX).