Description of the survey.

The following questionnaire contains audio files that were recorded either using an analog tube amplifier or a multi-effects processor, also known as a modeler.

For each example, a random generator will present you with either the recording from the tube amplifier or the one from the modeler.

Please evaluate whether you perceived the tube amplifier or the modeler.

Each audio file has a duration of approximately one minute. However, you may pause playback and continue at any time if you wish to submit your evaluation earlier.

All information is anonymous and non-personal.

Thank you very much for your participation.