De-tuning within a single piano string course.

Una corda vs tre corde.

• Una corda, forte
  Tre corde, forte
  Una corda, piano
  Tre corda, piano
  
  The una corda-string is raised by an 8th-tone.

  • Low range

• Una corda, forte
  Tre corde, forte
  Una corda, piano
  Tre corda, piano
  
  The una corda-string is raised by an 8th-tone.

  • Middle range.

• Una corda, forte
  Tre corde, forte
  Una corda, piano
  Tre corda, piano
  
  The una corda-string is raised by an 8th-tone.

  • High range.

• Una corda, forte
  Tre corde, forte
  Una corda, piano
  Tre corda, piano
  
  The una corda-string is raised by a 6th-tone.

  • Middle range.