First, the author presents three gestural captor systems: BioMuse developped by Hugh Lusted and Ben Knapp, Soundnet created by Sensorband (Atau Tanaka, Zbigniew Karkowski, Edwin van der Heide) and the Global string developed by Atau Tanaka and Kasper Toeplitz. In the second part, he considers fundamental aspects of interpretation with captors: limits, improvisation, relationships between the musician and their instrument, feedback, effort, nonessential gesture, memory and communication.