[Paper Review] LoopBoxes -- Evaluation of a Collaborative Accessible Digital Musical Instrument

Andreas Förster, Alarith Uhde+3 more|arXiv (Cornell University)|May 24, 2023

Assistive Technology in Communication and Mobility4 citations

TL;DR

LoopBoxes is a modular, accessible digital musical instrument designed for collaborative music making in special educational needs (SEN) settings, using tangible interaction and open-source technology. Evaluated in a music festival pilot (n=39) and a school case study, it enabled inclusive, intuitive music creation across age and ability groups, with strong potential for long-term classroom use when fully self-contained and plug-and-play.

ABSTRACT

LoopBoxes is an accessible digital musical instrument designed to create an intuitive access to loop based music making for children with special educational needs (SEN). This paper describes the evaluation of the instrument in the form of a pilot study during a music festival in Berlin, Germany, as well as a case study with children and music teachers in a SEN school setting. We created a modular system composed of three modules that afford single user as well as collaborative music making. The pilot study was evaluated using informal observation and questionnaires (n = 39), and indicated that the instrument affords music making for people with and without prior musical knowledge across all age groups and fosters collaborative musical processes. The case study was based on observation and a qualitative interview. It confirmed that the instrument meets the needs of the school settings and indicated how future versions could expand access to all students, especially those experiencing complex disabilities. In addition, out-of-the-box functionality seems to be crucial for the long-term implementation of the instrument in a school setting.

Motivation & Objective

• To design a modular, accessible digital musical instrument (DMI) that supports collaborative music making in special educational needs (SEN) school settings.
• To address the lack of DMIs that are intuitive, modular, and suitable for group use in SEN classrooms, especially for students with complex disabilities.
• To ensure the instrument is aesthetically appealing to both disabled and non-disabled users, countering the perception of 'substandard' assistive technology.
• To develop a system that functions out-of-the-box with minimal setup, supporting long-term integration in school environments.
• To evaluate the instrument in real-world settings—both in a public festival and in a SEN school—through mixed-methods field studies.

Proposed method

• Designed a modular DMI system composed of three core modules: a step sequencer, a loop module, and a melodic sequencer, each enabling individual or collaborative music creation.
• Implemented the system using Pure Data (Pd) for sound generation and control, with tangible interaction via physical buttons and sliders for intuitive access.
• Deployed the instrument in a pilot study at a public music festival in Berlin with a mixed audience (n=39), using informal observation and questionnaires.
• Conducted a case study in a SEN school setting using direct observation and qualitative interviews with children and music teachers.
• Integrated open-source hardware (Raspberry Pi) and web-based control interfaces to enable standalone, plug-and-play functionality for classroom use.
• Developed didactic scaffolding tools, including graphical notation scores, to support collaborative composition and layering of musical parts.

Figure 1: First prototype of the step sequencer module

Experimental results

Research questions

• RQ1 Can a modular, tangible DMI support inclusive, collaborative music making across diverse ability levels in SEN school settings?
• RQ2 How do children with and without prior musical experience interact with the instrument in both individual and group settings?
• RQ3 What design and usability factors are critical for long-term classroom implementation of accessible DMIs?
• RQ4 To what extent does the instrument support aesthetic communication and creative expression among children with complex disabilities?
• RQ5 How can open-source, modular hardware and software enable plug-and-play functionality suitable for school environments?

Key findings

• The pilot study (n=39) showed that LoopBoxes enabled music making across all age groups and musical experience levels, including those with no prior training, and fostered collaborative processes.
• In the school case study, the instrument was successfully used by all students, including those with complex disabilities, and was perceived as accessible and engaging by both children and teachers.
• The modular design was widely appreciated as a key strength, allowing flexible configuration to meet individual student needs.
• Group exploration was not universally effective; some students preferred individual exploration first, highlighting the need for both individual and group session options.
• Didactic scaffolding, such as graphical notation scores, was essential for helping students understand and manage collaborative layering of musical loops.
• Out-of-the-box functionality—especially standalone operation via Raspberry Pi and web interface—was identified as crucial for long-term classroom adoption, with teachers emphasizing minimal setup time.

Figure 2: Schematic View of the three modular instruments.