View source for SEP (PS Multi-Track Sequence Data)

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---
title: SEP (PS Multi-Track Sequence Data)
type: format
summary: Package of several SEQ data files managed as one file.
category: File formats
info: ID = SEQp
---

## Overview

A SEP is a package that contains several [SEQ](/formats/seq/) data files, so that the SEQ files can be managed as one file. A program accesses one SEQ in the package by the ID number returned when the SEP is opened and by the SEQ number. The access functions are described in the Run-Time Library Reference.[^ff43]

## Structure

The SEP opens with an ID and a version. Each SEQ in the package then follows with its own SEQ ID, timing fields and data size, and its score data runs to an end-of-SEQ marker. The fields and their byte counts are shown below.[^ff44]

Table: SEP header

| Field | Byte count |
| --- | --- |
| ID (SEQp) | 4 |
| Version | 2 |

Table: SEQ entry in a SEP

| Field | Byte count |
| --- | --- |
| SEQ ID | 2 |
| Resolution of quarter note | 2 |
| Tempo | 3 |
| Rhythm | 2 |
| Data size | 4 |
| Score data | Any |
| End of SEQ | 3 |

Figure 200 of the manual gives the tempo field as 3 bytes for SEQ 0 but 2 bytes for SEQ 1. The table above follows SEQ 0.[^ff44]

## References

[^ff43]: Sony Computer Entertainment Inc. File Formats. November 1998. Page 4-3.
[^ff44]: Sony Computer Entertainment Inc. File Formats. November 1998. Page 4-4, Figure 200.