Abstract: One or more electronically-controllable blocks rapidly vary the device's acoustic gain. The electronically-controllable blocks variably amplify or attenuate the incoming signal, controlled by the output signals of one or more level detectors. The input signals of the level detectors are representative of the acoustic input signal being processed by the apparatus and produce controlling signals in response to detection of sound pressure levels within a predetermined range. Multi-level compression is achieved when a first level detector in conjunction with an electronically-controllable amplifier block compresses signals which have an input sound pressure level above a compressor lower bound .alpha. and below a compressor upper bound .beta., and when a second level detector in conjunction with either an electronically-controllable amplifier or attenuator block compresses signals which have a sound pressure level above a second compressor lower bound .gamma.. For input signals of sound pressure level below .

Abstract: A container for photographs includes a container housing having walls defining a chamber, and a separating member subdividing the chamber into a main chamber for receiving a number of photographs and a sub-chamber for receiving negative strips for photographs. The photographs include a number of photograph prints arranged in edge-to-edge relationship, and a number of adhesive strips, one of each respectively being attached to the neighboring edges of such photograph prints to join the photograph prints into an elongated chain form.