What is "van halen's ""eruption"" prominently features the synthesizer."?

This statement is actually incorrect. "Eruption" is a guitar solo piece performed by Eddie Van Halen and is widely regarded as one of the greatest guitar solos of all time. The sound of the guitar in the piece is often mistaken for a synthesizer due to its unique and innovative sound, which Eddie achieved by using multiple effects pedals and techniques such as tapping and tremolo picking. However, there is no actual synthesizer used in "Eruption."