A conductor at a scoring stage watches a streamer travel across the picture and land on a punch. The punch is a bright circular flash on one frame marking an exact sync point. The streamer is the line that arrives at it, and its length maps to a fixed number of seconds, so the conductor sees the hit coming rather than counting toward it. That system was built for the Warner Bros. lot in Burbank, a few minutes east of Toluca Lake, and it survives because it solves something a click track does not.
What are streamers and punches, in physical terms?
Both were originally cut into the print. The music editor punched a hole in the visible portion of a frame at the sync point, which reads on screen as a momentary white circle. Ahead of it, the editor scratched the emulsion diagonally for a measured length, and that scratch reads as a vertical line moving across the frame. The length is the timing: one yard of scratch equals 2 seconds, four feet equals 2.67 seconds, five feet equals 3.33 seconds. Colour carried meaning too, with white, yellow, green and red signalling different actions to the players. Software renders all of it now, and the arithmetic is unchanged, because it was never about the film stock.
Why does a conductor need them when there is a click?
Because the two lock different things. A click fixes the tempo and holds it, which is what a cue with a dozen hits in ninety seconds needs. Streamers fix only the arrival point and leave everything between hits to the conductor, so the orchestra can push into a phrase and pull out of it and still land the cut. Marc Taddei, who has conducted soundtrack sessions on click, notes that listening to John Williams recordings with the click audible makes clear how much Williams was leaning on streamers instead, and that this is why the music breathes. The practical split I use when preparing a session: fast cues with tight hits get a click, rubato cues and anything with a long ritardando into a cut get streamers, and cues with both get a click that stops before the final hit.
What does that change about the files you deliver?
It adds a video deliverable that nobody asks for until the day. A scoring session needs a conductor's reference video with streamers and punches burned in, the cue title and timecode visible in frame, and a click routed separately so it reaches the conductor and the percussion section without bleeding into the room mics. That last point is the one that costs takes. A click at a level the drummer can hear inside a headphone mix will leak into a close mic on a quiet string cue, and it shows up as a 2kHz tick that no gate removes cleanly. Two headphone splits, one for the rhythm section at working level and one for the strings at a level 10 to 15dB lower, fixes it before the session rather than in the mix.
Where does Toluca Lake come into this?
Geographically, it is the closest residential neighborhood to the stage where this practice was standardised. Toluca Lake is a 1.22 square mile neighborhood of the city of Los Angeles in the southeastern San Fernando Valley, bounded on the south by Universal City, on the west by Studio City, on the north by North Hollywood and on the east by the city of Burbank. Its main street is Riverside Drive. The lake itself is 6 acres, privately owned by the surrounding homeowners, encircled by the Lakeside Golf Club, and completely inaccessible to the public, which is worth knowing before anyone plans a shoot around it. The bottom was surfaced with four inches of asphalt to stop seepage after well extraction and the 1930s channelisation of the Los Angeles River dropped the water table.
The boundary question comes up constantly and has a real answer. The Toluca Lake Chamber of Commerce states that Toluca Lake is a district of the city of Los Angeles, in the same sense as Hollywood or Studio City, and that the general neighborhood also spills over into Burbank, with different bodies drawing different boundaries for their own purposes. So the honest formulation is that Toluca Lake is an LA neighborhood whose eastern edge is the Burbank city line, and Burbank is a separate incorporated city.
Erich Wolfgang Korngold lived on the lake from 1938 to 1957. He was under exclusive contract to Warner Bros. from the mid-1930s, wrote eighteen original scores for the studio, and won Academy Awards for Anthony Adverse in 1936 and The Adventures of Robin Hood in 1938. The address was not sentimental. The lot was a short drive east, and a composer on a studio contract went to the stage often enough that the commute was a working decision.
What is the room itself?
The Eastwood Scoring Stage at Warner Bros. in Burbank is 5,000 square feet, sized for full orchestras, originally built in 1929, and fitted with a 96 channel AMS Neve 88RS-SP console feeding a machine room with four Pro Tools workstations. It was renamed for Clint Eastwood in 1999. A 5,000 square foot room with a decay long enough to flatter a string section is also a room where a click leak and a chair squeak are equally audible on a distant mic, which is the practical reason the deliverables above matter more here than in a small tracking room.
None of this is a claim of a session on that stage or any relationship with the studio. It is the nearest documented example of the room type that the streamer and punch system exists to serve, and it happens to sit a few minutes from the neighborhood where the composer who defined the Warner Bros. sound chose to live.
What still has to be decided before a stage gets booked?
Three things, in this order. Whether each cue runs on click, on streamers, or on both, because that determines who needs headphones and how the video is prepared. The bar-by-bar timing sheet, with every hit expressed in timecode rather than in bars, because the conductor works from picture and the copyist works from bars and the two have to agree. And the headphone split count, because adding a third split on the day means a break in the middle of a session that is being billed by the hour. Everything else can move. Those three set the shape of the day.
Frequently asked
What are streamers and punches? A punch is a bright circular flash on one frame marking an exact sync point. A streamer is a vertical line that travels across the frame for a measured number of seconds and arrives at that flash. Both were cut into the print originally and are rendered by software now.
Is Toluca Lake in Los Angeles or in Burbank? It is a 1.22 square mile neighborhood of the city of Los Angeles, bounded on the east by the city of Burbank. The local chamber describes the wider community as spilling over into Burbank, so the answer depends on which boundary is in use.
Do streamers replace a click track? No. A click fixes the tempo. Streamers fix the arrival point and leave the tempo to the conductor. Fast cues with many hits usually run on click.
If a cue is going to picture and the sync plan is not settled
Decide click against streamers cue by cue before the parts are copied, and put every hit in timecode as well as in bars. Full credit list with sources at /credits, background and contact at /about.