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---
title: SEQ (PS Sequence Data)
type: format
summary: Sequence data for the PlayStation sound library.
category: File formats
info: Extension = .SEQ
info: ID = SEQp
---

## Overview

SEQ is the PlayStation sequence data format, and its typical extension in DOS is ".SEQ". Several SEQ files can be packaged as one [SEP](/formats/sep/) file.[^ff43]

## Structure

A SEQ file opens with a header that gives the ID, the version and the timing of the score. The score data follows the header and runs to an end-of-SEQ marker. The fields and their byte counts are shown below.[^ff43]

Table: SEQ format

| Field | Byte count |
| --- | --- |
| ID (SEQp) | 4 |
| Version | 4 |
| Resolution of quarter note | 2 |
| Tempo | 3 |
| Rhythm | 2 |
| Score data | Any |
| End of SEQ | 3 |

## References

[^ff43]: Sony Computer Entertainment Inc. File Formats. November 1998. Page 4-3, Figure 199.