Sound Designer. Music Producer.
Audio Post-Production Expert.
With over 35 years in the music industry and 24 years as a composer, sound editor, and re-recording mixer, Walder Martinez has shaped the sonic identity of award-winning films, immersive series, and emotionally charged stories. From acclaimed productions for Prime Video to independent sci-fi films and haunting thrillers, his work spans sound design, original music, dialogue editing, and surround mixing. As founder of La Galera Multimedia, Walder merges technical mastery with artistic depth to transform every project into an unforgettable sensory experience.
“Sound is 50% of the movie-going experience.”
George Lucas
SOUND EDITOR
Walder turns images into full sensory experiences. His meticulous, story-driven approach has brought life to thrillers, dramas, and science fiction films—from cinemas to streaming platforms.
MUSIC PRODUCER
With a unique emotional sensitivity, Walder composes and produces music that elevates the narrative. His work ranges from atmospheric minimalism to cinematic grandeur, always in service of the story.
SOUND STORYTELLER
More than a technician, Walder is a natural storyteller. From script to final sound edit, he understands the emotional rhythm of each scene and amplifies it with sounds that speak to the soul.
POST-PRODUCTION EXPERT
With decades of experience in editing, mixing, and technical supervision, Walder leads post-production workflows with surgical precision. Every project—large or small—receives the same level of excellence.
My 7 Grandmas
Dialogue Editor
Gigi, an atheist teenager (Kate Larson), is forced to move from California to Minnesota with her mother (Candace Kirkpatrick) to help take care of her aging Grandfather (Jeff Allen) when his life spirals out of control after Grandma's death.
The Scream in the Blood
Composer
This is the story of Cali (Abel Ayala), a teenager whose father was killed during a horse race, and he must quickly become a man, driven to avenge that death. Cali seeks revenge, but first finds the love of Lucía (Florencia Otero) and help in Don Chusco (Horacio Guarany), an old ranch foreman who adopts him as his own son.
Nemesis
Composer - Full Audio Post-Production
Father Thomas, nearing retirement, becomes engrossed in mysterious Byzantine discoveries from Istanbul and enlists Adriel, a young multilingual priest, to help translate cryptic letters. Adriel catches the attention of Grace, Father Thomas' free-spirited daughter, who is curious about his mysterious past.
English 
Spanish