After OP-1, the following products released by Teenage Engineering (Pocket Operators) followed in the footsteps started by Kraftwerk when in 1981 they created the song “Pocket Calculator” which contained the famous chorus “I'm the operator / With my pocket calculator” and they performed live playing with an adapted version of the Casio VL-80 music calculator. Pocket Operators are synthesizers and rhythm machines with the appearance of calculators, very low cost and that can be connected to each other to, among all, create all the functions of electronic synthesizers (drum machines, bass lines , chords, samplers and voice synthesizers). Each of them has a liquid crystal display in the place where calculators usually display the digits but POs use it to show useful information on the operation as well as an animation that rhythmically accompanies the sounds.

To further accentuate the playful nature of these machines, after the series of 9 basic Pocket Operators they created special editions of some of them with sounds from television series or video games such as Rick and Morty, Mega Man or Street Fighter.

Name	Poliphony	*	Function	Resources
PO-12 Rhythm	6	func	LFO (15), LPF (5,6), HPF (7,8), Delay (4), Vibrato (16), Distortion (2), Stutter (9,10), Repeat (11,12), Low sample rate (1), Bit crush (3), Note shuffle (13), Feedback (14)	Drum track generator. Cada sonido es una capa (máximo 6 capas a la vez). Step multiplier. User Guide Old school Pocket Operators revisited Red Means Recording PO-12 Rhythm Introduction
PO-14 Sub	1+1	key o-o	LFO (12), LPF (5,6), HPF (7,8), Delay (4), Vibrato (16), Distortion (2), Stutter (9,10), Feedback (11), Low sample rate (1), Bit crush (3), Octave up (13), Octave Down (14), Half note up (15)	Capa sonidos un único sonido (1-15, notas c0-d2) y capa drum kit (16). Old school Pocket Operators revisited Red Means Recording PO-14 Sub Introduction PO-14 Cheat Sheet
PO-16 Factory	1+1	key o-o	LFO (12), LPF (5,6), HPF (7,8), Delay (4), Vibrato (16), Distortion (2), Stutter (9,10), Feedback (11), Low sample rate (1), Bit crush (3), Octave up (13), Octave Down (14), Half note up (15)	Capa sonidos un único sonido (1-15, notas c3-d5) y capa drum kit (16). Red Means Recording PO-16 Factory Introduction Old school Pocket Operators revisited PO-16 Play Styles PO-16 chords Figured out the PO-16 chords
PO-20 Arcade	1+1	chord	LPF (5,6,7), HPF (7,8), solo chords (1), solo chords+lead (2), solo drums (3), solo drums+bass (4), fill-in (9,10), retrigger (11,12), glitch (13,14), blinds (15), rising arpeggio (16)	[Standalone] 16 sonidos independientes: 1 bajo, 7 percusiones, 16 posibles acordes y 4 sonidos melódicos. Sin notas, solo variaciones de pitch con las perillas. Step multiplier. Fade out. Old school Pocket Operators revisited Red Means Recording PO-20 Arcade Introduction UPDATED: PO-20 chords & keys
PO-24 Office	6	solo	LPF (5,6), HPF (7,8), aliasing (1), overdrive (2), repeat (3,4), Distortion (9,10), Retrigger (11,12), glitch (13,14), blinds (15), noise (16)	[Live Jams] Es un drumkit con sonidos de oficina. Old school Pocket Operators revisited Red Means Recording PO-24 Office Introduction
PO-28 Robot	1+1	glide	Distort/retrigger, repeat, LPF, HPF, Glitch/noise	[Live Jams] Capa sonidos un único sonido y capa drum kit (16). Old school Pocket Operators revisited Red Means Recording PO-28 Robot Introduction PO-28 robot hidden features
PO-32 Tonic	1+1	acc		Red Means Recording PO-32 Tonic Introduction
PO-33 K.O.	4	record		PO-33 K.O! sampler quickstart Red Means Recording PO-33 Introduction PO-33 K.O! Hidden Features and Extended Manual PO-33 cheat sheet and resources Available scales on PO-33 K.O
PO-35 Speak	1+1	record		PO-35 Speak in depth(draft) Red Means Recording PO-35 Speak Introduction PO-35 speak and PO-137 Hidden Features and Extended Manual True Cuckoo PO-35 Speak Tutorial
PO-128 Megaman	2+1	glide		Edición especial de la PO-28 Robot creada en colaboración con Capcom Co., Ltd., una empresa japonesa desarrolladora y distribuidora de videojuegos. Create track with PO-128 Megaman
PO-133 Street Fighter				Edición especial de la PO-33 K.O. creada en colaboración con Capcom Co., Ltd., una empresa japonesa desarrolladora y distribuidora de videojuegos.
PO-137 Rick and Morty				PO-35 speak and PO-137 Hidden Features and Extended Manual

• Teenage Engineering User Guides
• Teenage Engineering Pocket Operator Video Tutorials
• Teenage Engineering Pocket Operator Online lessons
• A wall of sound in your pocket: the tale of Teenage Engineering’s Pocket Operator
• All the Pocket Operators! - Ultimate Overview
• Pocket Operator Charts