Performance operation apparatus

A musical performance operation apparatus comprising:

• a distance sensor including:
• a first substrate including a first conductive circuit;
• and
• a second substrate including a second conductive circuit spaced from the first conductive circuit,
• wherein the distance sensor is configured to measure a distance between the first substrate and the second substrate;
• an operating element operable by a user;
• and
• a holding portion detachably holding the first substrate between the operating element and the second substrate and configured to move together with the operating element,
• wherein the holding portion includes a first plate portion and a second plate portion,
• wherein a position of the first plate portion and a position of the second plate portion are changeable,
• wherein in a first state of the holding portion, where the first plate portion and the second plate portion sandwich the first substrate, the holding portion holds the first substrate, and
• wherein in a second state of the holding portion, where the first plate portion and the second plate portion are further apart than in the first state, the holding portion releases the first substrate.

A musical performance operation apparatus comprising:

• a distance sensor including:
• a first substrate including:
• a surface;
• a conductor disposed on the surface and forming a first conductive circuit;
• and
• at least one of a notch portion or an opening extending through the surface;
• and
• a second substrate including a second conductive circuit spaced from the first conductive circuit,
• wherein the distance sensor is configured to measure a distance between the first substrate and the second substrate;
• an operating element operable by a user;
• a first member interlocked with the operating element;
• and
• a holding portion holding the first substrate between the first member and the second substrate and configured to move together with the first member,
• wherein part of the holding portion extends into the at least one of the notch portion or the opening.

A musical performance operation apparatus comprising:

• a distance sensor including:
• a first substrate including a first conductive circuit;
• and
• a second substrate including a second conductive circuit spaced from the first conductive circuit,
• wherein the distance sensor is configured to measure a distance between the first substrate and the second substrate;
• an operating element operable by a user;
• a first member interlocked with the operating element;
• and
• a holding portion detachably holding the first substrate between the first member and the second substrate and configured to move together with the first member,
• wherein the holding portion includes a first plate portion and a second plate portion,
• wherein a position of the first plate portion and a position of the second plate portion are changeable,
• wherein in a first state of the holding portion, where the first plate portion and the second plate portion sandwich the first substrate, the holding portion holds the first substrate, and
• wherein in a second state of the holding portion, where the first plate portion and the second plate portion are further apart than in the first state, the holding portion releases the first substrate.