Installation Versus Tonal Finishing

Mechanical installation is the physical erection and connection of the instrument in the building, carried to the point where the organ stands complete and functions. Firms describe their stages in their own words. Muller Pipe Organ Company, for example, lists a six-stage process for a new organ, beginning with listening and drafting a plan and proposal, creating drawings, construction, and quality assurance in which the entire organ is assembled before leaving the shop. The last two stages are installation, by a team that includes the craftsmen who made the organ, and tonal finishing, which the firm describes as the final tonal regulation of each pipe in the instrument. They come in that order, and the firm publishes no durations for any stage.

An instrument can stand mechanically complete and functioning before any tonal work begins: John Bishop’s 2022 account of a Gabriel Kney organ relocated to Saint Meinrad records exactly that sequence. Mechanical completeness is where finishing starts, not a stage that includes it. How that regulation step fits inside the rest of a move is covered on What Happens During a Pipe Organ Relocation.

Tonal finishing is the adjustment of the installed instrument’s sound in its final location, judged in the room’s acoustic context. The AIO guideline describes the work in pipe-level terms: the pipes of each individual stop should be meticulously regulated for uniformity of character, strength, and attack. The same clause says voicing should be done in a careful, workmanlike manner using accepted techniques, and that flue pipes in general should be regulated for proper speech, neither unduly slow nor fast, to suit the attack characteristic of the windchest valve, which ties finishing to the action as well as to the pipe. How that adjustment is actually made at the pipe is voicing technique, and it belongs to the pipework and tonal services pages rather than here.

The order is fixed because finishing works on an instrument that already stands complete, in the room whose acoustics it is being fitted to. AIO construction guidance places tonal finishing in the organ’s final location after mechanical installation, with regulation and balance judged in the room’s acoustic context, and there is no earlier point at which that judgment can be made: until installation is complete, neither the instrument nor its position in the room exists as it will be heard.

The practical consequence is that finishing cannot be folded into the last day of installation. It is a separate phase with its own personnel, its own duration and its own place in the schedule, and a proposal should show it as one. The guideline does not define qualified personnel or say how long the work takes, so both of those belong to the written proposal rather than to the guideline. The guidelines are advisory in any case: the Institute publishes them as guidance and disclaims any warranty that its members comply.

The room is part of the instrument’s sound, so the sound cannot be finished without it. The Garden State Theatre Organ Society states that an organ cannot be properly regulated at the factory, because the size of the organ, “the resonance of its chambers,” the size of the venue and the acoustics of the building all come into play. The Society describes the work as melding the sounds of the various pipes and ranks into ensembles, a process it says organ builders worldwide have practiced for centuries.

Mander Organ Builders describe their own practice in similar terms: the final tonal regulation of the pipework is always done on site so that it can be matched to the acoustic of the environment in which the organ is to live. Dobson Pipe Organ Builders go a step earlier, describing how they examine the prospective installation space and voice sample pipes in that actual environment before the tonal finishing done during installation, a process the firm says may extend over months.

Each of these is an organization or a firm describing its own practice, and none of them is a standard. Together they explain why the room is a design input and why a stoplist transplanted from one building to another would not reproduce the same result. The room’s volume, surfaces and reverberation are the context finishing is judged in; what those should be for an organ, and how surface treatment changes projection, is covered on Room Acoustics, Surface Treatment, and Organ Sound Projection.

Some voicing is done in the shop and some on site, and firms divide the work differently. Greg Bover of C.B. Fisk, Inc. said in 2010 that although pipes are shop-voiced, each one of those pipes has to be adjusted to the acoustics of the building, and that the real work of the sonority starts once the thing is installed. David Sims, writing the same year about a different firm’s project, describes the voicer completing nearly all of the voicing in the shop while the organ was being made, with on-site finishing allowing for adjustments after installation.

These are two documented accounts of two firms with different philosophies, and they are opposed in emphasis: one puts the substantive tonal work on site, the other in the shop. Neither is the industry norm. What a given proposal means by voicing and by finishing, and how much of each happens in the room, is something to ask the firm and have written into the scope, because these two accounts show that the same words can describe very different amounts of site time.

Voicing, regulation, tonal finishing and tuning are used differently by different authorities, and no single usage is settled. Two distinctions are stated by more than one of the sources cited here and contradicted by none of them. The first separates voicing from tuning: Wikipedia’s flue-pipe article, an encyclopedia entry subject to revision, defines voicing as the art of achieving the required tonal quality from each pipe, as distinct from tuning, which is setting its pitch.

Stephen Adams, a practitioner writing in 2014, likewise describes tuning as the adjustment of a pipe’s vibrating length in every case, and treats regulation problems caused by action deficiencies or wind supply as a separate matter from tuning. The second distinction separates tonal finishing from tuning: the Garden State Theatre Organ Society treats tuning as an activity distinct from voicing, regulating and finishing, and notes that voicers spend years learning their work.

Beyond those two lines the usage diverges. The Society treats the remaining terms as interchangeable, introducing tonal finishing as “also known as voicing or regulating.” Colin Pykett, in an independent technical article, draws a sharper line: voicing adjusts two parameters, tone quality and loudness, and the adjustment of loudness on its own is termed regulation, which makes regulation a subset of voicing. The American Theatre Organ Society’s restoration guidelines of July 1992 (section 3.B) state that voicing and re-regulation should be considered tonal finishing and should include regulation of an instrument to fit its acoustical environment.

The AIO guideline, by contrast, uses all three words in one clause without equating them: voicing done in a workmanlike manner, flue pipes regulated for proper speech, and the whole instrument tonally finished in its final location. Patrick J. Murphy & Associates’ glossary, for its part, defines voicing as the regulation of a pipe’s speech and tone quality, and has no entry for tonal finishing, for regulation on its own, or for tuning, so its definition is evidence of one firm’s usage rather than of settled trade terminology. These positions stand here side by side; they are not reconciled, and none of them is presented as the trade’s agreed meaning.

Because the trade does not agree on the words, a proposal has to say what it means by them. If one firm’s quotation offers voicing on site and another offers tonal finishing, the two may be describing the same work, different work, or different amounts of the same work, and the guideline a reader might use to compare them uses the words in yet another way. The protection is definitional: the written scope should say what adjustment is included, whether it is done in the shop, on site, or both, who performs it, and how the end of the work is recognized. Tuning should be named separately if it is included, since the sources cited here treat it as a different activity from the tonal work, and the tuning pages cover it on their own terms.

Documented on-site finishing durations run from two weeks to a year, and the figures come from projects too different to compare. C.B. Fisk, Inc. described in 2010 an on-site construction period of five months to a year and a half, followed by a further five months to a year of voicing carried out by two-person teams who go through every single pipe. Brigham Young University reported, while its Orgues Letourneau instrument of 72 stops and 4,603 pipes was still being installed, four years of planning and design, ten weeks of on-site construction and then eight weeks of what the university called tuning and voicing; because the item was written while the work was in progress, the eight weeks is a plan rather than a completed record.

David Sims described a two-week tonal finishing trip in summer 2009 on Opus 48, a three-manual, 59-rank organ in Macon, Georgia. For Rosales Opus 42 / Parsons Opus 51 at St. James by-the-Sea Episcopal Church in La Jolla, California, installation began in June 2022, tonal finishing began in February 2023, and the instrument was officially accepted on 23 July 2023; the builder-authored account gives no explicit finishing duration and notes only that much of the organ was complete and playing in time for Easter.

The spread means a schedule should carry finishing as a range agreed with the firm, not as a number borrowed from another project. The four figures describe instruments of different sizes, conceived differently, finished by different firms, and reported by different kinds of witness: a firm describing its own practice, a university describing a plan, a visiting organist describing one trip, and a builder describing its own project after acceptance. They are not averaged here and should not be averaged in a plan.

What they do establish is that finishing has its own calendar, that the calendar can be short or long, and that the end of installation is not a usable proxy for the date the instrument will be ready to be heard as intended. The dates that matter to a congregation or a concert program, such as a dedication or a first service, need to be set against the finishing schedule the firm actually proposes, with the acceptance point defined in writing.

Published guidance and the firm and project accounts cited on this page do not state what happens to an instrument when installation is completed but tonal finishing is curtailed, deferred or omitted. They establish that finishing is a distinct phase performed after mechanical installation; they do not describe the condition of an instrument left at the end of installation, how long such a condition can be sustained, or whether finishing taken up later produces the same result as finishing that follows installation without a break.

That is a gap in what has been published and read, not evidence that the question has no answer; accounts of unfinished instruments may exist in trade publications not cited here. For planning, the consequence is plain: a proposal that allows finishing to be cut short or moved to an unspecified later date is leaving a stage undefined, and the owner should ask the firm directly what the instrument will be at the point installation ends and finishing has not begun.

As of August 31, 2026, Craftsman Pipe Organs offers installation, relocation, voicing and tonal finishing among its services, delivered through its direct workforce, with outside domain expertise used case by case when required and disclosed to the customer. That is a stated offering, not a promise about any particular project: the exact scope, the performing party, and the licensing, engineering and permitting decisions that attach to a given installation are project-specific and are controlled by the accepted written documents.

For an owner, the useful step is to have the two stages described separately in whatever proposal is under consideration, with the words defined, the location of the work stated, the duration carried as a range, and the acceptance point named. Nothing published here or elsewhere replaces inspection and assessment of the actual instrument and the building it will stand in; the room, the instrument and the condition of both are what the finishing will be judged against, and they have to be seen. Documenting what was agreed for each stage, and what was actually performed, is what lets an owner know at closeout that the instrument was finished and not merely installed.