Just for supplement: Non-pedal harps are either tuned to a fixed key, or have a mechanism (called *hook*) for each string, to modify its pitch a half tone upwards. This takes some preparation, so chromatic changes are not possible on the fly, but only in longer breaks. Harps with hooks were often manufactured in Bohemia.

Also note, that tuning a harp is frequently necessary and due to the high number of strings takes considerable time.