Hardware Eq
Challenge 
These challenges can include:
Equipment Malfunction: Issues with
hardware such as microphones, mixers, and recording devices can disrupt the recording process
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Fundamentals of Audio Engineering 
Equipment Used in Audio Engineering Audio engineers utilize a variety of equipment to capture and manipulate sound
...Audio Interfaces
Hardware that connects microphones and instruments to a computer, converting analog signals to digital
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Nebenberuflich selbstständig 
Nebenberuflich selbständig ist, wer sich neben seinem Hauptjob im Anstellungsverhältnis eine selbständige Nebentigkeit begründet.